Our Pope is a Heretic.
There’s just no arguing that.
And it belies the assertion of infallibility.
The doctrine of Infallibility is only negative, not positive. It's the Holy Spirit playing defense.
What it boils down to, is not that the Pope cannot have an erroneous theological opinion, but that he will not be able to declare that opinion in such form that it becomes part of the irreformable doctrine of the Church.
It is not so much a guarantee to the pope as if he were an all-purpose oracle (he is not), but a protection to the Church that errors in faith and morals will not become fully and formally binding on Catholics.
The gist of it in 2 minutes:
How to Understand Infallibility in Two Minutes
It's pretty funny.
"Therefore, the true opinion is the fifth, according to which the Pope who is manifestly a heretic ceases by himself to be Pope and head, in the same way as he ceases to be a Christian and a member of the body of the Church; and for this reason he can be judged and punished by the Church. This is the opinion of all the ancient Fathers, who teach that manifest heretics immediately lose all jurisdiction.."
-Saint Robert Bellarmine, Doctor of the Church