Infallibility is widely misunderstood by even practicing Catholics. It only applies in very specific scenarios and has only officially come into play a couple of times in the history of the Church. It dates back quite a bit according to the Catechism. Here's some more info if you're interested: https://www.catholic.com/tract/papal-infallibility.

That being said, I'm kind of surprised he hasn't been laicized or something along those lines as well.