AI has autonomously found (many) proofs of False in Lean and Rocq, so it's not merely a theoretical concern. A misaligned AI agent tasked with proving the near-impossible just might wind up smuggling in a bug deep in a lemma somewhere (anyone remember the days back when AI routinely made tests pass by "fixing" the tests?). That said, I doubt OpenAI would be so foolish as to not do a cursory vetting of the proof for malicious compliance, so the actual odds are probably pretty low.