That thread raised alarm bells. It was a gradual build-up. His (her? I don't know) early threads were about rejecting truth in favor of trust. It was a weird fucking paradigm with a ton of mental gymnastics to basically get us to admit that we shouldn't accept the black pill as truth or look for the black pill in truth, but should instead seek the black pill in trust? And who to trust? Why, this super selective order of black pill monks, of course. It had "glownigger" written all over it. It's similar to what the FBI does when they create militias to recruit right-wing, anti-establishment types to then bait into committing domestic terror crimes for their sting operations.
That was step 1: dumbing down the forum. Then came the threads about the "brown" pill. That was step 2: a necessary intermediate step that created a door to open to ideas that would slowly erode the forum - ideas like rejecting the dog pill.
If that user hadn't been banned for the dog pill thread, I can practically guarantee it in writing that over the course of several months we would have seen progressively worse threads that kept moving the forum's Overton window. In a year or two this whole place would have become a full-blown reddit-tier blue pilled dumpster fire with tons of internal strife. We used to have forum wars about face vs height. By then we would have had threads seriously discussing why women should be allowed here.
That's the thing with infiltrators. You either spot them very early on or when it's too late, which is equivalent to never having spotted them.