Ask HN: Why are the Elon Musk topic submissions being suppressed?

Maybe it was happening before, but I've noticed it a lot in the last few days - every time there is a thread about Elon Musk, it disappears from the front page extremely quickly, regardless of how many upvotes it has (or the speed of them).

I knew Hacker News had built in abilities for their moderators to promote and suppress content, but I am very surprised at the topic/consistency of this suppression in this instance. What gives?