The truth is, I have no idea and I don't think it's all that productive in most cases to try to sort it out or talk about it. I didn't actually say anything at all about what the person was; I simply highlighted flaws in their argument and linked to one of their other comments and let the reader draw their own conclusions. In this case I think they were so self explanatory that I didn't really need to indicate any of what my conclusions were.

But... to deal explicitly with my conclusions, I'll say that in almost every case where there's some kind of weird nonsense-logic, and then poking through the person's history instantly yields some "let's not vote for Biden" advocacy, I do personally tend to draw the conclusion that they're a political shill. If I saw a bunch of geopolitical stuff or extended arguments about Marxism then that would tilt the scales in favor of tankie (although like I say, this is only my private logic about it, not like anything I would present as conclusive, because it's basically impossible to tell.) Going into mainstream political forums and getting real vocal about how people involved with mainstream US politics are supposed to engage with it doesn't strike me as real common tankie behavior.