Many posts get resubmitted if someone finds them interesting and, if it's been a few days, they generally get "second-chance" treatment. That means they'll be able to make it to the front-page based on upvotes, if they didn't make it the first time.

There are a couple of paths to resubmission, the auto dedup if close enough in time vs fresh post / id. There are also instances where the HN team tilts the scale a bit (typically placing it on the front iirc)

I was curious which path this post took, OP answered in a peer comment