NVIDIA creating an open source driver (well, throwing code over the wall once in a while is still open source I guess) does not mean there's an upstream driver. The kernel maintainers have already noted that it's definitely not in any shape to be merged upstream (and would need close to a full rewrite)
"He's resigning because he thinks the community should focus on that driver instead now" is completely false and I have no idea how you even got to that conclusion. Literally on the same day he posted this email, he also posted initial GSP support which specifically gives us a bright future in nouveau, as it means we can now do funky stuff like reclocking (and which will be further developed by some other people in his team at RH).
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So there's quite a few errors here:
That clears up my specific confusion perfectly! Thanks!
Me when I lie on the internet:
33 people who upvoted this (as of writing) now have misinformation in their heads, which they'll probably spread around the internet thanks to you.