This link has now been reposted 6 times in the past two weeks:
https://news.ycombinator.com/item?id=22816645
https://news.ycombinator.com/item?id=22729766
https://news.ycombinator.com/item?id=22801191
https://news.ycombinator.com/item?id=22784712
https://news.ycombinator.com/item?id=22816645
https://news.ycombinator.com/item?id=22729766
https://news.ycombinator.com/item?id=22801191
https://news.ycombinator.com/item?id=22784712
On HN, a submission doesn't count as a dupe unless it has had significant attention. This is in the FAQ: https://news.ycombinator.com/newsfaq.html.
Plus they didn't get much traction anyway, so I wrongly assumed there wasn't interest.
Know for the future now!
Sometimes posts that deserve to be on the front page don't make it. Seems fine to repost periodically as long as you aren't spamming many times per day.
This isn't true at all, for the record.