This glosses over the corrolary catholic doctrine that the pope cannot promulgate heretical doctrine as he is guided by the holy spirit. If the pope said some crazy shit in an interview, it’s not “infallible”, but it also can’t be wrong on a doctrinal level.
The idea that there has only ever been two Ex Cathedra statements is also incorrect as per the Congegation of the Doctrine of the Faith. Ratzinger declared that letters written by John Paul II on matters like women ordination were Ex Cathedra and also that in general a lot more stuff is Ex Cathedra than is “traditionally presented”.

The angry atheists, as per usual, are closer to being right than the apologists.