Sure, but "works with nVidia" isn't the same as "works with everything," since there's a lot of other hardware to consider, though I'd imagine the latter case would be mostly easy for an end user to work around.
That's all I'm really pointing out with that part, and if I'm wrong, then it's only good news for the rest of us.
But the benefit of SteamOS is going to be marginal at best since lots of distros are already highly capable for gaming. Waiting isn't going to bring with it some magical improvements that makes it the default choice over CachyOS, Bazzite, PikaOS, etc.