Ignored, but unrefuted ^^^

What's there to refute? I said there were likely some holdouts even after Vatican I. Besides that, you don't actually cite anything from these sources, just claim that they hold what you say. If they actually hold to Cajetan/SJT's opinion after Vatican I, then they're simply wrong, as the majority of theologians concluded also, but my guess is that they have nuances to it that exceed your ability to grasp. So why don't you actually cite the texts? Maybe they explain why they believe that the opinion is still tenable after Vatican I. More than likely, however, they have sedeprivationist nuances in their opinion.
Bottom line is that Vatican I dogmatized the principle of
suprema sedes a nemine judicatur, and so no judgment can be rendered against a Pope unless the erstwhile Pope had already ceased
ipso facto to be the pope. Pope Innocent II or III (forget which one) taught that a heretical pope shows himself "to have already been judged", and so the declaration is merely a clarification of something that had already taken place.
Let's take a scenario where a Pope goes openly heretical in the month of May. It isn't until October that an Imperfect Council can convene to declare him deposed. Meanwhile, in June, July, August, and September, this "Pope" continues to issue Encyclicals, some of which contain errors, etc. This Council convenes and declares that this "Pope" had departed from the Church in May, from the time he became a manifest heretic. So was he the Pope in the intervening months?
Nor does your S&S link actually cite most of the texts, just make a claim about what they're saying and put them in a footnote.