They aren't going to sit on millenium solutions regardless (so if Hodge and /or BSD is really done it will get announced especially because of the baseless accusations), and they aren't going to stop trying to solve P/NP and Riemann. The letter doesn't really matter. It's not the first time, and I don't think AI's dramatic ramp in capabilities ever had positive reception from the bulk of mathematicians anyway.
Yeah, I don't expect them to stop, but I do think they are probably hurting themselves, as well as mathematics, by continuing do to this.
Imagine if they had handled this differently and these results - still using OpenAI models - were coming from the math community. How much better the PR would have been - AI helping math/science rather than yet another story of AI harming society in some way.
No doubt this is what they were at least partially aiming for - not just shooting a trophy animal to brag about, but also being seen to advance math/science, a la AlphaFold, not just take all our jobs and enshittify society with deep fakes and AI slop. But, they heavily misjudged.