Nothing is suppressed. I see stories about Elon Musk/Twitter every day on HN basically. If anything it's the opposite of suppressed.

No, sometimes important posts slip past by. And I made this comment when this post was not on the front page.

I was pawing around deep in the third or fourth page off the main one when I ran across this, and was really surprised to find out it hadn't gone viral even though it proved to be true

I don't think there's anything wrong with it being unpopular, though. Personally, I hate Twitter and don't care if it lives or dies. But a lot of HackerNews readers seem really invested in the site and smaller news than this has dominated the front page before