Should call this site "embarrassed hacker propaganda." At least then you'd "have a leg to stand on." What a gross tactic you've relied on here.
I’m perfectly happy with appealing to authority when you respond to Josh Tripplet’s point about the author being a longtime contributor with these weird followup questions about “biggest?” and whatever, which in turn was a followup to the bizarre statement about invading projects ([1] again). Linus Torvalds is fine with the Rust in the Kernel experiment. This author is a longtime Linux contributor. So yes indeed: who are you to question Rust in the Kernel project?
To unpack a bit. Everything can be questioned. But with some sort of temperance and perspective. Talking about pushing “hacks upstream” is over the top and unfounded considering the context (what you call appeal to authority).
It would be appropriate if these were outsider upstarts that didn’t have a history in this project. But it aint.