what’s true is the pope is indeed infallible in things pertaining to faith and morals
what’s not true is the pope would infallibly declare something contrary to scripture
indeed, there have been things that some popes said that is contrary to scripture and sacred tradition BUT it was never said that it was an infallible declaration and that therefore means that its just that pope’s opinion and is not something that we should believe as a dogma
if the pope is not infallible then how do we know that the canon of the bible itself is not a big mistake? after all, it was the pope(Pope Damasus) who decided what the canon would be