But when women are oppressed because they belong to that particular class, pretending that that oppression can somehow be eradicated by getting rid of the distinctions between the 2 classes makes no sense. How does stopping recording births as male or female help girls who face female genital mutilation? How does it reduce the 1 in 6 likelihood that a woman will be the victim of sexual assault?
Initiation into that class begins at birth. Formal registration and social rituals around binary sex difference affirm that class structure and uphold the myth that there are two different kinds of human being.
It's a proposed legal reform. Legal reforms alone don't fix complex social problems, they just try to improve the framework we use to understand those problems, bring law into line with changes in how social phenomena are understood, and make it possible to gain redress for harms which currently fall through the net.
The interaction between the GRA 2004 and the EA 2010 creates a flashpoint. You could characterise it as bad law (I'm obviously not a lawyer), but both acts have important human rights implications which most people can understand, so law reform needs to safeguard the rights currently protected whilst doing all the things above. I believe the report is a good-faith exploration of some of the possibilities of reform in this area, with bigger picture thinking that makes it potentially exciting feminist territory. I don't think it warrants the entrenched hostility you're bringing to it.