Someone in government needs to intervene on this issue and soon.
It's not particularly the issue of teaching primary school-aged children about gender theory, but the inherent danger in teaching young children about something that contradicts their innate understanding of basic concepts.
Children work in absolutes and categories. This tree is tall; this bug is small. A dog is not a cat.
Later, when they have grasped these concepts, they develop the ability to refine them. This is when they can begin to accept that a lion is a "big cat", because "cat" is not just about Tiddles but also a name of a class of animal.
Then when they reach their later teen years, they are able to mentally consider why those categories exist and what challenges those parameters. It's only really adults that can start to consider the subversion of those categories, and remain able to psychologically function.
But if you challenge a young child's understanding of a basic concept by saying it is the opposite, you won't necessarily persuade the child what you are saying is "true". Instead, the child is more likely to think you are lying and therefore distrust you.
And this is the problem. You cannot sustain a situation where children think their teachers have lied to them, because they will become suspicious of everything else the teacher then says.
It happens a lot when teachers do something that children perceive as "unfair." Children don't react by saying "I didn't agree with her" or "I must have got it wrong" ; they react by beginning to mistrust the teacher and saying "I don't like Mrs. Packing anymore" or "I don't want to go to school anymore because Mrs Packing is horrible because she told Leo off and it wasn't Leo who broke the handle, it was Ellie."
In short, if you start to try to teach concepts that go against primary school aged children's understanding of the world, you won't change theur perspectives, you will just undermine the trust pupils have in their teachers, and if you lose that, the entire educational process will be undermined.
The whole thing just falls apart.