alt Hacker NewsIt would appear no one else submitted the posts in question, so the most obvious answer is the account is finding interesting articles that no one else has found. It would be one thing if it won out of many dupe posters, but that doesn't seem to be what's happening.
This is valid.
1. each one is a first-party vendor announcement, submitted very close to the announcement and under the vendors headline.
2. Titles are "verbatim" vendor headlines. No editorializing which follows HN guidelines to the letter.
3. Someone; a script/agent is watching vendor feeds and X accounts then submitting within minutes of the posting.
4. Altman/Navier–Stokes post got [duped] so prob not inside thing.