This is like saying the Nazis were socialists because they had "socialist" in the name of the party. Just because a group brands itself as something doesn't mean they are that thing.

The charitable interpretation here is that you don't realize what your post looks like in context, and you're being weirdly pedantic, sharing an abstract possibility that we have no reason to believe is relevant in this case.

The uncharitable assertion is that you want people to believe that the label is incorrect... but you're afraid or incapable of making the argument, so you are maliciously sowing doubt.

Neither are a particularly good look.

You're claiming that they're not really antifascists?