J.K. Rowling
If I declare that, as of tomorrow, the word 'fish' means 'piscine creatures and anyone else who enjoys a paddle', fish will continue to be fish. If you want to invent a word that means 'women and men who assert they're women on the basis that they identify with stereotypes associated with women/are sexually excited by pretending to be women', carry on. The word 'woman' is taken.