I really think the state needs someone to represent the child's interests here - any social service experts around?
I still cannot get over how this person has done this amazing, overwhelming (and essentially female) thing of giving birth to a living human and seemingly their only concern is pronouns and titles and how other people see them. This does not bode well for their other parenting decisions. Poor, poor child.
Plus, as a parent of a slightly older child, I know they're not going to be able to lie forever. Children once they're old enough call you out on lies and they're not particularly forgiving. I do wonder why this person wanted a child so much. They don't seem to care much about the child on the basis of their actions.