Everyone always wants to prevent cures for autism, but no one ever suggests inventing something that gives people autism. (It was sort of a plot point in a Vernor Vinge novel. And Brave New World?)
Problem is there is autism like (maybe) Einstein or Tesla and then there is autism where the child can't communicate or adapt to any form of human social interaction or contact. The former is neurodiversity, the latter a debilitating disease. These are not the same thing and need different terms.
Or, even if they were in some sense fundamentally the same, is your argument that their effects are so practically different that they ought to be called by distinct names anyway?