Trans-hostile pressure group "Sex Matters" have been using the term "Sex Realist" to describe their ideology for at least 6 years already.
The attempt by transphobes to proclaim their position as 'biological reality' was always a grim mirror of the "race realist" position. The Idea that social relations are sharply overdetermined by biology acts as a blank cheque for discrimination and persecution. TERFs are showing their true colours.