Are these actually antifa, or are they just a group of tankie retards someone arbitrarily decided to label 'antifa'? Just making sure.

Well, Russia doesn't only support their propaganda in the right-wing sphere, they also do it sneakily in the left-wing one. Where they support US left-wing sites that talk about usually things like BLM and healthcare. This is not normal, but once in the while, they post stuff that is excusing Russia and China and throwing all the blame on the USA. And after the Ukrainian War, it went up 200%.
NFKRZ (a left-leaning YouTuber from Russia, that left due to the rise of the Z cult) made a good video about it.
https://www.youtube.com/watch?v=cY5Qd7rTC8M&ab_channel=NFKRZ