Who are those other people? They should be informed as well.
In the last 24 hours, you have the typical "page king lol" responses from a number of users, a back-and-forth staring with "posting from school bitches", two fucking pony threads, and some business about wrestling 173. Only some of which were posted by Mikealike.
In the mod post, you cited that most of this dude's recent posts were in Thread as a problem, which could probably be said for Americium241, Live2Die, Waterfire, and perhaps a few others. I don't recommend any sort of action related to these users, because as inane and stupid as Thread is, its continued existence is a tacit admission by staff that it's an allowable space for pointless numbskullery.
Now, if you want to lock Thread, that's another discussion. But it seems to me there was more than enough cause in the random comments on article discussion threads (where we do have clearly defined and enforced expectations) to revoke membership without throwing in reasons that seem arbitrary by my reckoning. Why weaken your case by including that?