I get what you're saying, but this is an HN thread. I see people from companies I use to work at post in these threads sometimes.

It's less a formal post and more like "Hey I'm on a team hiring, here's what the job entails, email me (or recruiter) if interested!"

Yes it might technically amount to a job posting, but being pedantic and making this forum a hellish place probably isn't a good idea :)