Hopefully someone like Linus can make absolutely clear this is total garbage.
The source code is released.
No one disagrees there.
Buy unlocked hardware if you care about this. Most PC's can disable secure boot paths through BIOS settings unless you are in a corp environment and they lock that out.
Hell, even v3 is insufficient for what Stallman wants; it only requires being able to install new versions of the covered code. It doesn't cover other proprietary programs that can see if you've modified the Free program and refuse to work. You can't actually prohibit that with a license unless you want to go full Ethical Source and start impinging on Freedom Zero.
Yes, this may not mesh with Linus's intent, but Linus already has a very specific idea of how the GPL works that applies to Linux and only Linux. The whole "you can load proprietary kernel modules as long as they don't touch internals" thing springs to mind.
Also, I'd like to point out that people haven't "lost the fight" with GPLv3. There's plenty of libraries out there that use it - they're just not particularly relevant to Linux, so nobody's really pushing for a relicensing effort.