I'd encourage you not to take his word for it, these are extreme views that are not reflective of Catholics in general (and I saw at least one person in those threads pointing this out, though I didn't read the threads closely). I've met at least one Catholic who would describe his views as heretical.
I'd also encourage you to reexamine if "slavery is okay sometimes" is really equivalently "crazy" to other religious ideas (like say, "love thy neighbor"), I think that is pretty uncharitable to religious people.
He might not address Epstein, but he does argue that "heretics can be executed as long as there's due process." That is some low key religious fascism ("it's okay to execute heretics as long as we control the government first"). Most Catholics I know oppose the death penalty (they successfully lobbied to make it illegal where I live, because they felt it was incompatible with their religious convictions).
You might look more into "Traditionalist Catholicism" if you are interested. I enjoyed this short (45m) documentary. https://youtu.be/icwDF8wRgF4