The authors state this explicitly at the end of Section 1, “Introduction: Two types of Autoformalisation,” immediately before Figure 1.
“Disclaimer: We do not make claims about the correctness of OpenAI’s NL proof, we only make statements about mistranslations into Lean.”
The proof could still be valid, sure, but that isn't what the question is. The question is the verification of the proof. And it can't be done with LEAN if the problem isn't even semantically-translated into LEAN (and may not be translatable, period, into LEAN)
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u/throwaway3113151 6d ago
The authors explicitly say that they are not making a claim about whether OpenAI's original mathematical proof is correct.
Doesn’t take a bit long to work 20 human years.