That's what happens when a submission receives multiple flags. It's not a censorship conspiracy theory.

Also, at 72pts/100comments, it probably set off the flame war detector.

Why would it get flagged?

There was a lot of yelling from both sides of the conversation, mostly about topics unrelated to the article itself. While the thread should have been about the actions Voat's host took against it, most of the discussion was off topic, and overly heated at that.