Here, St. Robert Bellarmine would disagree with Bishop Schneider: St. Robert Bellarmine: What if a Pope to Become a Heretic
Ping
The case of Honorius I is instructive. He was posthumously anathematized by an Ecumenical Council and a later Pope for doing precisely what this document does...try to play cute with heresy.
https://www.newadvent.org/cathen/07452b.htm
I tend to agree with St. Robert Bellarmine on that point, but that’s never been defined, and it raises a whole host of other questions, such as who would make that determination, and how.
Nevertheless, Bishop Schneider is a faithful, brilliant, and courageous man who should be listened to.