Second chance pool, it's been a feature since before your account was created. It's a list (second link below) of submissions that didn't gain much traction and gets drawn from to add to the front page periodically. They get an artificially inflated ranking and temporarily changed submission time (which impacts ranking) to give them another chance.

https://news.ycombinator.com/lists

https://news.ycombinator.com/pool - Your submission is on the third page here

https://news.ycombinator.com/invited - Another way old posts come back

Might’ve gotten a temp hold put on it since it’s a perennial repost. I’ve posted it myself a few years back!

It’s a classic, and bears resurfacing occasionally, but it would make sense to flag it for admin approval.