Interesting. I took a screen snapshot of the front page: https://imgur.com/gallery/thY5Tl6

Compared to #1 and #2 ranked posts, which have half the upvotes, but uploaded within the same hour or two, this post is ranked #19.

Maybe many people are "flag"-ing the post so the HN ranking algorithm pushes it lower.

(Edit: For the record, I don't believe the HN mods are doing any downmodding here, and it's probably just due to the ranking algorithm and behavior of the HN audience)