I disagree about the Byzantines they accepted John XXIII and attended the council. They changed the rites along with everyone else.
No, the Byzantine Rite changes were extremely minor, mostly consisting of some melodies.
According to you, then, the hierarchy has defected. Every single Catholic bishop "accepted John XXIII". There was perhaps a single bishop who did not attend the Council out of principle.
Your litmus test for being Catholic and orthodox is utterly absurd.
You ducked for cover early about the "pure" bishops, but you've come out with exactly what I suspected. And then these nuns cover their tracks by lying that Pearce didn't attend Vatican II.