Honestly this looks like Microsoft must have thrown a pile of money at them to not mention it, as it's just too obviously the main question.

No one seriously cares about this running Windows. We want Steam and CUDA/Ollama, and Windows just gets in the way. nVidia are simply not that oblivious, but I have to admit in their position I'd have considered the Microsoft involvement more trouble than it's worth, which is among the many reasons I'm not a billionaire.

Maybe they think the RAM market is so terrible it will kill the whole initiative regardless.