It's one thing to say that TERFs aren't feminists, but I think the more important point is that TERFs have provided a brand of "feminism" that misogynists can enjoy. A kind of "feminism" that succeeds due to its patriarchal seal of approval.
Of course that's not feminism, and it's one thing to criticise that, but in a lot of media avenues that are still patriarchy-led it has replaced feminism, which is far more dangerous.