Well, if you go with the thought process of "Antifa actions are really the actions of paid government agents, sleeper agents, foreign spies, or any of their manipulated NPC tools", you could make the argument Antifa doesn't exist as an NGO, perhaps.

Someone moved those piles of bricks, someone bussed in those people, it isn't a 100% deboooonked idea that those "someone"s could, in fact, not be an organization called Antifa but instead an alphabet letter agency operating as Antifa as a shell organization that for effective purposes does not exist.

But somehow, I don't think they're going with this theory, but instead just trying to gaslight the public.