The account posting it belongs to an employee of kubos. Usually that would be tolerated around here, if it's on-topic and they were to add something akin to "full disclosure: I work for this company". You could debate if it's relevent enough to the article, but either way it'll seem way too close to spam with just that one-liner.

I think the constant evangelism of Rust enthusiasts - “let’s rewrite X in Rust!” - gets to some HN users, which in turn leads to (often times unfair) downvoting of Rust-related comments.