Would that not have been called Asperger’s in the past?
Anyway, I suspect "in the past" is further in the past than you think: the distinction between Asperger's and ASD has been officially ditched by the medical community for 12 years now, at least insofar as the DSM represents consensus.
I'm gonna push back on this. There isn't an objective way to diagnose someone with autism like there is with, say, a vitamin B deficiency.
What we do know is the medical community continues to diagnose boys with this condition at a much higher rate than girls.
This would not appear to imply a "false" belief.