If he were to just address the big picture, there wouldn't be as much to debate.
You can't address the big picture without examining the underlying details because the 'big picture' is built on facts.
Let's just say that you agreed with me that
1) V2 was fallible and erred and that did not violate indefectibility, because it didn't teach officially
2) the new mass was a trick and not obligatory on anyone (this is 100% confirmed by Benedict in his "motu")
If you believe this (as I do) what's the next step? The next step is to say that:
1) the pope and hierachy are still heretics ON THE PERSONAL LEVEL it's just that their heresy is not OFFICIAL church teaching
In other words, they BELIEVE the heresies that V2 "proposed" in its indirect, ambiguous, non-binding way.
2) the new mass is new, it's not obligatory and it's (probably) invalid, 100% illicit and 100% immoral.
Ergo, Fr Chazal's argument about sedeprivationism still applies. We must separate ourselves from the hierarchy because they are heretical. I'll even say that sedevacantism is still in play but for the reason that the pope/bishops are personal heretics.
All I'm arguing is that we cannot say that the pope/bishops are heretics because V2/new mass were OFFICIALLY errors. We can say they are wrong for a 1,000 other reasons, but not for these 2. The legal facts do not show that V2/new mass are binding, therefore it's not a matter of indefectibility.