Thank you - this is what I have understood the GRC to confer. A "legal fiction" which prevents anyone for being discriminated against because of their preferred "gender" - it doesn't say that the law now declares a man a woman, nor a woman a man, in every sense.
Like much other legislation concerning the trans debate and protected characteristics of individuals, it has been deliberately manipulated and misinterpreted to be what TRAs want it it be, rather than what it legally is, for so long, and to such an extent, that the lie has now, in many people's minds ,become the truth.
(Much like such common fallacies as that a shoal of piranha will skeletonise a cow in 3 minutes - no matter how big the cow or how small the shoal. 3 minutes it is.)