Please don't make speculations like that about HN. I'm pretty sure it's against the rules, and even if it isn't, it doesn't foster good discussions.

You can't always know what is the reason a story is or isn't on the front page. For the record, at the moment, this story is the top story on https://news.ycombinator.com/active, which is the main way I personally view HN. So I doubt it's being actively hidden.