No that’s quite accurate, they are against antifa. For example, Fox News hates antifa. They regularly call them a terrorist organization, use them as a pejorative or a bogeyman to dismiss protests or opinions. One could reasonably conclude they are very anti-antifa, making them anti-anti-fascist. This is indeed a double negative, which can be confusing and even misleading. If you seek to clarify the situation by removing the “anti-anti-” double negative, what does that make them?

… that’s correct, “fascist”.

Does that clarify things at all? Yes, I think it does. Interesting.