Pope St. Celestine Teaches Ipso Facto Deposition of Heretics

“The authority of Our Apostolic See has determined that the bishop, cleric, or simple Christian who had been deposed or excommunicated by Nestorius or his followers, after the latter began to preach …More
“The authority of Our Apostolic See has determined that the bishop, cleric, or simple Christian who had been deposed or excommunicated by Nestorius or his followers, after the latter began to preach heresy, shall not be considered deposed or excommunicated. For he who had defected from the faith with such preachings, cannot depose or remove anyone whatsoever.”2
What is the difference between an excommunicate and an open heretic?
Sean Johnson
This heavily implies ipso facto loss of office for public heretics (In addition to proving the “excommunications” of Lefebvre, the 4 SSPX bishops, and Vigano worthless).