No offense, but reading through the comments it's apparent you're not very familiar with systems programming nor linux development. This is a common problem with vocal 'rustaceans', rust is their hammer regardless of the domain.
Although considering rust is prudent, there are still a ton of advantages to using C for systems programming. It is not a binary choice, there are pros and cons, and every project should choose what aligns with their priorities.
No one has ever stated that linux will be in the kernel. It was 'go ahead and give it a shot', which includes convincing maintainers to accept your patches. Linus has delegated trust to subsystems maintainers and an established process.
Hellwig could have been more tactful, but like it or not, arguments against a cross-language codebase have merit. Framing it as a 'clear confession of sabotage of the r4l project', attempting to weaponize the CoC, and trying to drum up an army via social media was all out of line.
Success was never a given, if they want r4l to succeed then they have to get patches approved and crying wolf ain't gonna cut it.
I'm sure he has an alternative, like tattooing it on the forearms of 'undesirables'.