So, Hacker News is not a "pure" news source. It's primarily tech news. Don't look for a conspiracy, as it's completely up to the moderators as to what stays on the front page. Effectively, it's curated. I like the mix here. Not everything has to be covered by a popular "news" site.

It wouldn't be the first time. I've observed for quite some time now that even much more relevant articles get deep sixed.

It might have to do with some of the comments posted here.