There's a much stronger correlation: these accounts (plus a couple others—who are also active in this thread) all comment about one highly specific, niche topic which absolutely no one else on HN does. It's the claim that the Bush-era NASA Administrator, Mike Griffin, is a unrecognized key figure behind SpaceX' founding.
Just query "spacex mike griffin", and it's exactly these accounts (and people who reply to them).
Yes, more (very obviously connected, they're literally posting the same comments) accounts have turned up and gone more in that direction after I made my initial comment.
There was a similar set of users I've been involved with on Reddit that got banned on Reddit for sock puppeting and similarly on Wikipedia who got banned for sock puppeting.
Just query "spacex mike griffin", and it's exactly these accounts (and people who reply to them).
https://hn.algolia.com/?query=spacex%20mike%20griffin&type=c...