For sure there is a significant difference between what is referred to as "high functioning autism" and traditional ("low functioning" autism). But I feel that if those folks want to differentiate then it would be much smarter to come up with a different term and romanticize that.

The only reason to appropriate the term "autism" and associate with that condition is to medicalize one's psychology and obtain funding and services that previously were reserved to "low functioning" autistics (before that term was even necessary).

(edited to clarify)