I can't read the whole thing but the gist of Grillo's thought seems to be that the only thing required of Catholics is to follow the current direction of the Vatican. He (somewhat indirectly) states that the old liturgy WAS sacred but is NO LONGER sacred. Following is all that is required. And even if an Angel from heaven....?

One of the architects of Traditionis Custodes: Hidden Origins of Traditionis Custodes: Grillo and Francis’s Self-Abrogation

A heretical apostate, through and through.