Incorrect: As has been discussed in this thread, the pope can be the subject of a discretionary judgment, but not a coercive judgment.
What's incorrect is your improper application of the distinction. If one is merely assessing the fact that the Pope has left the Church and lost authority, that means he's already ceased to be pope
a priori to the judgment (Bellarmine), but if your judgment comes
a priori to the loss of office, you're effectively deposing a Pope. Your position and that of S&S entails precisely such a coercive judgment, which is why St. Robert Bellarmine rejects it. You can argue Bellarmine vs. Cajetan all you want ... and it's a distraction from the real issue at hand and the one that confronts the consciences of Catholics ... it doesn't change the fact that a legitimate Pope freely exercising the Papal Magisterium cannot effect the corruption of the Magisterium, doctrinal or moral teaching, the Church's public worship, the
cultus of the saints, etc. And this is precisely why, IMO, the infiltrators allowed Siri to accept the papal election and then forced him out. Had they simply gotten their guy Roncalli elected without this prior impediment to legitimate election, the Holy Spirit would have prevented Roncalli, Montini, and Wojtyla from perpetrating their destruction, even if it meant causing them to drop dead before they could do so.