We can’t be the judge.
A few papal quotes to start with:
Pope Adrian VI ( 1523)
If by the Roman Church you mean its head or pontiff, it is beyond question that he can err even in matters touching the faith. He does this when he teaches heresy by his own judgment or decretal. In truth, many Roman pontiffs were heretics. The last of them was Pope John XXII ( 1334). (Quaest. in IV Sent.; quoted in Viollet, Papal Infallibility and the Syllabus, 1908).*
Pope Innocent III ( 1216)
The pope should not flatter himself about his power, nor should he rashly glory in his honor and high estate, because the less he is judged by man, the more he is judged by God. Still the less can the Roman Pontiff glory, because he can be judged by men, or rather, can be shown to be already judged, if for example he should wither away into heresy, because he who does not believe is already judged. (St. John 3:18) In such a case it should be said of him: If salt should lose its savour, it is good for nothing but to be cast out and trampled under foot by men. (Sermo 4)