Their rules PDF says they won't accept any solution until at least two years after publication in a qualifying outlet. This allows time for the mathematical community to review and accept new results. As the OpenAI proof hasn't been officially published yet, the clock hasn't started ticking.
And chances are they never will publish it in any kind of useful format. Right now, the scientific community is outraged at OpenAI for going about their announcement in the least productive fashion they could have. It really does seem like they have no interest in progressing our understanding of maths outside of mining it for marketing material.
I don't care much for AI myself, or smart phones either, for that matter. I would be content if NS remained a mystery for another 100 years - or forever. But goodness, does the "scientific community" need to take a deep breath and count down from 10.