I think they should cast a wider net. Toxicity might discover trolls in the original sense, i.e. individuals seeking a dopamine rush. The trolls I have in mind try to steer the narrative on certain topics with comments that aren't rude or inflammatory per se and, like I said, even seem elaborate on the surface.* But if it's done for spin, it's still toxic nonetheless.

What the researchers say about disengagement also applies to these type of trolls. I mentioned persistence, it's what ultimately makes countering these users futile. Anyone who realizes that tomorrow there will be a new thread with the same narrative eventually disengages.

*) More often I see accounts posting long comments in such a short amount of time that I doubt a human was naturally engaging in an online conversation. I would be ashamed to admit how long it took me to write my two comments in this thread and then I see accounts posting much longer comments back-to-back in under two minutes.