You are correct about Rust not being mentioned explicitly, but I am yet to see a stream comments about memory safety coming out of say the Java, Python, Go, Haskell, etc. community. Then again, maybe I am wrong?

As for petty. "[B]uilding a new browser in 2024 using an unsafe language is such a facepalm it's hard to take the entire project seriously." sounds pretty darn petty and dismissive to me for a project that is making good progress. We desperately need diversity in terms of web browser implementations and "not taking seriously" a project which could very well become viable within the next few years solely based on their programming language of choice feels wrong to me (even as someone with next to no love for C++).