But if a LLM writes such a paper, how do you know there aren't any issues in it that cause wrong probabilities/distributions?
Terry Tao talks about this challenge in some of his blog posts and interviews, it's pretty interesting.
Yes, for inspiration or search they are great tools.
Review enough of those without doing the proving yourself, and you'll soon lose the ability to review. And have LLMs do the course work for you at math school, and you might never acquire such ability to begin with anyway.