I think it would be fair if you also would disclose that you are working in Mozilla and that you are directly connected to Rust when defending it on HN.
Sounds like overkill to me? Would a comment in a profile be sufficient? (Disclaimer: I'm working on a web based brainfuck ide/compiler/optimizer for my own amusement, and thus probably have some kind of dog in some kind of fight here?)
It is also possibly helpful if the commenter is elaborating on product that they are involved in to establish that their input is authoritative.
And not to give cause for inflated heads here :) but seriously, if you are seriously interested in this space, you sh/would already know the cast of mvps and thus major contributors such as Russ Cox or Patrick Walton (et al) would not require introductions.