But cis is an unnecessary term, made up by the TRA brigade. There's no need for it. Not agreeing that a transw is a woman, or female isn't the same. Neither is true, they aren't women and non-trans women and men are not "cis." People have been managing for thousands of years, by referring to an easily identifiable binary of woman / man, or whatever the equivalent words are.
One side is simply pointing out an observable fact, the other is trying to enforce language, so that they get their kicks by bullying. As you'll have noticed, it doesn't wash any more, especially from a legal standpoint.
That isn't to say that I'd meet a transw and go, "Eurghh! You're a bloke in a dress!" On the other hand, if they did a performative, "Do you think I'm a woman? I am, aren't I?" as Willoughby and others do, I'd say no.