@Xenia I don't think the GRC has any bearing at all over whether we can call a particular 'AMAB' individual a man. Nor does it prevent disclosure of their 'dead name'.
What the GRC does do is give legal recognition, for official persons.
As far as the public goes, my understanding is that a 'hate incident' is anything perceived to be on the basis of gender identity. And that's true even if they are not transgender, it's still classed as a hate incident if the incident is based on perceived gender identity.
So if you called a transvestite in the ladies toilets a 'male pervert', that could potentially be a hate crime. The GRC does not have anything to do with it all. It's sufficient that it's based on perceived gender identity, whether in fact that person identifies as a man is scarcely relevant.