I wouldn't say this study is "bad". It certainly is *interesting* and feels it has a mark of truth on it from my experience.
No network I've been on, LiveJournal, MySpace, Facebook, Pownce, Twitter, Fedi, BlueSky is free of these issues.
None. Of. Them.
They all end up replicating the same social patterns no matter how we try to tech the social dynamics away.