Cardinal Muller would be correct IF it were possible for a true pope to become a (formal) heretic. However, Fr. Paul Kramer has amply demonstrated in his two volume work of To Deceive the Elect that a true pope cannot be a formal heretic, even privately. In regards to Jorge Bergoglio, we can factually see that he is a public formal heretic and therefore cannot be a true pope.
Please stop attributing power to Jorge Bergoglio that he does not have.
No. Jorge Bergoglio is an antipope that has fooled even the clergy and faithful of the True Resistance. He is, however, the head of that sect called the Conciliar Church.
True Resistance, please get out of your material schism.
Medical doctors are practitioners. They are not scientists.