I remember thinking that it was a real stretch to interpret different release announcements, separated by months, as "duplicate" posts. But this was coming from dang himself, so I guess that's the authoritative view.
Just pointing out that Gitlab operates on a more or less monthly release cadence. Pretty much every release gets an announcement thread on HN's front-page for the full day. And usually there's a separate front-page thread or two in between, to announce stuff in upcoming releases. I've never once seen any of this removed, or even questioned.