When asked about what would happen if a pope did commit heresy, Burke — recognized as one of the world’s foremost authorities on Roman Catholic canon law — agreed with Peters’ analysis that such a pope would automatically cease to be pontiff.
“If a Pope would formally profess heresy he would cease, by that act, to be the Pope. It’s automatic. And so, that could happen,” he said.
https://www.thecatholicmonitor.com/2023/07/lifesitenews-when-asked-about-what.html