So, Ladislaus - in your opinion, was JP2 a Modernist?
Modernism is an umbrella term. You still have to identify a specific proposition to which JP2 tenaciously adhered that was contrary to faith. I'm not arguing right now about whether JP2 met the criteria or not, just trying to establish the criteria.
I really think that when St. Robert was speaking of manifest heresy, he was imagining a pope going around saying something like, "I don't really believe in the transubstantiation." and not something more obscure like, "I think that Religious Liberty can be reconciled with tradition." That's why St. Francis de Sales used the term "explicitly".
When it comes to practical application also, remember that heresy is a high bar and not every error is heresy. So, for instance, I don't think that Religious Liberty is a heresy; a grave error, yes, but heresy no. Most of you know what I think that the only thing these popes do believe that constitutes heresy is ... it's their ecclesiology and soteriology. But, alas, most Traditional Catholics actually have the same
Suprema Haec ecclesiology. That's why I'm torn on the issue. If you guys aren't heretics with this ecclesiology, then neither are the V2 popes; they're simply taking this ecclesiology to its quite logical conclusions.
In fact, I am quite serious when I have said that if I believed in
Suprema Haec ecclesiology, then I would immediately drop all resistance to Vatican II and submit to the Vatican II popes.