It boiled down to a transwoman who has had genital surgery and therefore claims to be a woman saying another transwoman was not a woman because said second TW hadn't had the surgery.
The court ordered an investigation which culminated in a report that, amongst other things, the accused held that view about TW who have not had genital surgery in general.
Classic transmisia. (Finally found an example that makes some vague sense of this interesting guide.)
Trans folks can be agents of transmisia as well… by perpetuating the notion of gender binary or "passing" superiority and using it to discriminate against other transgender people. For example, a trans woman at a company may refuse to hire a genderqueer person because their gender presentation might "confuse" customers, or a trans male administrator at a traditionally women's college may deny the application of a non-passing trans woman for not "transitioning enough."
https://simmons.libguides.com/anti-oppression/anti-transmisia#:~:text=Transmisia%20(also%20called%20Transphobia)%20is,antagonism%20directed%20against%20transgender%2Fnonbinary