It seems that this particular link was posted by the same poster 4 times over the past few weeks [0]. Given the pattern of repeat reposts I assumed it's an experiment to see which times are best to post to get more traction.
https://news.ycombinator.com/newsfaq.html
"If a story has not had significant attention in the last year or so, a small number of reposts is ok. Otherwise we bury reposts as duplicates."
Which is why I explicitly stated I assumed it's just an experiment of sorts and I didn't imply anything nefarious.
The optics of posting the same links from the same websites suggest going beyond "I found this interesting" towards something more about getting the clicks.
Sometimes HN is used just to garner audience, and while the letter of the rules may be observed, the spirit certainly isn't [0] (you may need to enable seeing dead threads).
(To clarify, I’m not the one who downvoted your comment above)