I'm not trying to make a value judgement, but isn't this sort of counter to how English is typically spoken? Adjectives usually come before the subject, for instance, one would say "look at that red car" and not... well I don't even really know how to organically word it any other way... "look at that car which is red" I guess. The latter sentence sounds very awkward to me.
The intention is to stop neurological conditions being adjectives. 'look that car has a sunroof' for example is much more natural than 'look at that sunroofed car'.
Indeed you are right. "Sally is a person with autism" is admittedly a mouthful and seems counterintuitive.
The difference between Sally and the car is that the car is an object, and Sally is a human being whose neurological differences are often stigmatized.
