I went and found the source of that photo, it was just another bunch of garbage, from the “reformers’” trash, I guess they spend entire days rooting around in it.
Here’s the source, go there and scroll down. Amazing junk.
http://marienfried.com/catholic%20teachings/false%20popes%20versus%20infallibility.html
I know. So did I. I put on my environmental suit, proof against toxins and decay bacteria, and went into that cesspool for a look. We say that the floor of hell is paved with the skulls of (Christian) bishops. I know where the Reformers go...