Is Hacker News inserting links to Work at a Startup hiring posts?

Recently I started to notice that the Hacker News front page contains hiring posts linking to Work at a Startup, https://www.workatastartup.com/, also part of YC. The posts appear on the front page (with 1 point), but cannot be upvoted and don't contain comments or a discussion. Visually, the posts are identical to other posts (except for the voting buttons).

Just curious: did I miss an announcement about hiring posts being inserted on the front page?

https://news.ycombinator.com/from?site=workatastartup.com

https://hn.algolia.com/?dateRange=pastMonth&query=workatastartup.com&sort=byDate&type=all