Rust isn’t mentioned in the article at all.

For the actual change about Rust in 6.4, see this email chain.

https://lore.kernel.org/lkml/20230429012119.421536-1-ojeda@kernel.org/

As one commenter there mentioned, there’s no mention of Rust in the article (except a “More Rust code” bullet point). Rust is literally becoming a meme and a buzzword at this point with people getting excited about something when it mentions being written in Rust without asking questions about code quality, speed etc…