I haven’t rtft but how can anyone pretend to be downs. You either have downs syndrome or you don’t.
Isn't that the point? If the material reality of biology is in dispute, you can identify as anything you wish.
When human sexual dimorphism is characterised as a "spectrum" and the hard of thinking swallow this nonsense and go ahead and develop public policy on the basis of fantasy, people can identify as Downs-afffected. Or women. Or goldfish. Even as Northerners.
It makes a terrible mockery of the people with Downs who live good lives with their challenges, but ethics seems not to be a strong point of fetishists.