By their Fruits.
Not only are they acting against the "Summorum Pontificum" of Pope Benedict, they are - in a damning themselves - The Papal Bull of Pope (St) Pius V "Quo Primum" authorised only the Tridentine Liturgy to be celebrated in the RCC forever.

Quo Primum

Promulgating the Tridentine Liturgy
Pope Pius V - 1570
"This Missal is to be used by all churches, even by those which in their authorization are made exempt, whether by Apostolic indult, custom, or privilege, or even if by oath or official confirmation of the Holy See, or have their rights and faculties guaranteed to them by any other manner whatsoever.

This new rite alone is to be used unless approval of the practice of saying Mass differently was given at the very time of the institution and confirmation of the church by Apostolic See at least 200 years ago, or unless there has prevailed a custom of a similar kind which has been continuously followed for a period of not less than 200 years, in which most cases We in no wise rescind their above-mentioned prerogative or custom. However, if this Missal, which we have seen fit to publish, be more agreeable to these latter, We grant them permission to celebrate Mass according to its rite, provided they have the consent of their bishop or prelate or of their whole Chapter, everything else to the contrary notwithstanding.

All other of the churches referred to above, however, are hereby denied the use of other missals, which are to be discontinued entirely and absolutely; whereas, by this present Constitution, which will be valid henceforth, now, and forever, We order and enjoin that nothing must be added to Our recently published Missal, nothing omitted from it, nor anything whatsoever be changed within it under the penalty of Our displeasure.

We specifically command each and every patriarch, administrator, and all other persons or whatever ecclesiastical dignity they may be, be they even cardinals of the Holy Roman Church, or possessed of any other rank or pre-eminence, and We order them in virtue of holy obedience to chant or to read the Mass according to the rite and manner and norm herewith laid down by Us and, hereafter, to discontinue and completely discard all other rubrics and rites of other missals, however ancient, which they have customarily followed; and they must not in celebrating Mass presume to introduce any ceremonies or recite any prayers other than those contained in this Missal.

Furthermore, by these presents [this law], in virtue of Our Apostolic authority, We grant and concede in perpetuity that, for the chanting or reading of the Mass in any church whatsoever, this Missal is hereafter to be followed absolutely, without any scruple of conscience or fear of incurring any penalty, judgment, or censure, and may freely and lawfully be used. Nor are superiors, administrators, canons, chaplains, and other secular priests, or religious, of whatever title designated, obliged to celebrate the Mass otherwise than as enjoined by Us. We likewise declare and ordain that no one whosoever is forced or coerced to alter this Missal, and that this present document cannot be revoked or modified, but remain always valid and retain its full force notwithstanding the previous constitutions and decrees of the Holy See, as well as any general or special constitutions or edicts of provincial or synodal councils, and notwithstanding the practice and custom of the aforesaid churches, established by long and immemorial prescription – except, however, if more than two hundred years’ standing.

It is Our will, therefore, and by the same authority, We decree that, after We publish this constitution and the edition of the Missal, the priests of the Roman Curia are, after thirty days, obliged to chant or read the Mass according to it; all others south of the Alps, after three months; and those beyond the Alps either within six months or whenever the Missal is available for sale. Wherefore, in order that the Missal be preserved incorrupt throughout the whole world and kept free of flaws and errors, the penalty for nonobservance for printers, whether mediately or immediately subject to Our dominion, and that of the Holy Roman Church, will be the forfeiting of their books and a fine of one hundred gold ducats, payable ipso facto to the Apostolic Treasury. Further, as for those located in other parts of the world, the penalty is excommunication latae sententiae, and such other penalties as may in Our judgment be imposed; and We decree by this law that they must not dare or presume either to print or to publish or to sell, or in any way to accept books of this nature without Our approval and consent, or without the express consent of the Apostolic Commissaries of those places, who will be appointed by Us. Said printer must receive a standard Missal and agree faithfully with it and in no wise vary from the Roman Missal of the large type (secundum magnum impressionem).

www.papalencyclicals.net/pius05/p5quopri.htm

How many DELIBERATELY excommunicated themselves?
How many are unaware of how betrayed they have been?

According to Fr Hesse (RIP) (A hugely knowledgable Canon Lawyer)

www.youtube.com/watch

a NEW MASS in strict disobediance to "Quo Primum" is a schismatic act against the Pope's Decree. To disobey an Order, opens up a can of worms. Popes remained obediant to the document all through the centuries, making absolutely no alterations to the Missal of Pope St Pius V. (apart from the tampering with Holy Week performed by Bugnini during the last years of the pontificate of Pius XII whilst he was suffering extreme health issues expecting to die.
In 1570, the Holy Spirit THROUGH Pope (ST) Pius has tried to avoid future problems occuring at the hands of the"Modernists" by Canonising the Traditional Rite of Mass! To not obey the Decree - shows a contempt for the Dogmatic Declarations of a former valid Canonised Pope.

Fr Hesse (who knows what he is talking about) says that The New Mass is schismatic. Due to the Decree of "Quo Primum" the Novus Ordo can never be called "Legitimate " He said that our Sunday morning day of obligation should be to the Old LATIN Rite of Mass only.
These people claim the "Novus Ordo Mass" is "legitimate" and the Authorised Mass of the Church needs to be discontinued. The opposite is true!
The Holy Ghost can not have changed His mind - the Pope used Dogmatic Language and nowhere should any Catholic remain in a High Position of Authority if they are contemptuous of the Dogmatic Declarations of a former Pope.

Since the Holy Spirit demanded "No New Mass FOREVER" in 1570, why does that same "Holy Spirit" now condemn His former proclamation?
Clearly we are being led by a schismatic Rite the FALSE Church as warned about in Prophecy, and The Book of the Apocalypse. A Luciferian sect - who control those who WOULD be faithful and obediant to the TRUE Church, were they to be made aware that the hierarchy they are following are leading them further and further away from the Lord whom they sincerely hope to be obediant to. This Luciferian Church (as prophecised by Marie Julie Jahenny, Bl. Anne Emmerich etc) consider all that is valid, obediant, Tridentine, Traditional, Faithful and TRUE is in "schism" to THEMSELVES and their False heretical, Vatican II NEW church.

I won't say that WE are in trouble. but
THE DESTROYERS OF THE AUTHENTIC TIMELSS LITURGY SURELY ARE.....