Unless they just swiped the workbooks of the actual mathematicians that where working on the problem using AI and it's in the "next-gen" training dataset.
And that's before we get into the whole 'salt the earth' way they ended up solving it. For a short period of time it may well have been the least valuable proof in mathematics yet. In their haste it's dubious they actually read the proof, and I don't think anyone has had time yet to truly understand it (the original researchers are best placed to do so, but are they even willing?).
So now it is solved, the proof has been independently verified and nobody has an incentive to investigate further. OpenAI has spent millions to uncover 1 bit of information that so far nobody has learned anything from, and they've demotivated all the people who wanted to.
The point of these problems is the understanding / tooling gained in solving them. We're getting none of that. At best they are like a modern oracles, correctly answering your questions in a way that's doesn't help you any. (At worst,...)
Even with many of our best minds working on it for nearly a century, it _just_ now was solved just as AI became very good at math. Doesn't seem too farfetched to me to assume that AI played an outsized role in solving it. If it was really just a matter of "stitching things together" to solve it (granted, this is a very reductive way to look at it) , I suspect we would've solved this a while ago.
One is really impressive and useful trick, one is AGI.
Apple's research show almost zero emergent behaviour, so I'm inclined to think most of it was already in the weights.
It doesn't take away the usefulness, it just defined the boundary. We can't expect "original research" then because it actually can't reason about concepts that are too far from whats already in the discourse. The discourse is big so we don't notice.