That’s not their view, it’s their propaganda. No one has ever made any actual, credible argument that anything about “antifa” is actually “fascist”.

But that's really the height of silliness. I can say that all people who describe themselves as 'anticapitalist' are actually capitalists, but that doesn't change anything about those people, the ideology in question, or the world.

Are some people who call themselves antifa secretly fascists? I'm sure they are. So?