Only when you look at ASD as the a whole. And that's a gross over-simplification, one which is actually hotly debated.
Asperger's itself is a VERY specific subset of ASD, and they are known to be typically extremely high functioning and usually normal to high IQ.
Asperger's Syndrome to Autism Spectrum Disorder | Interactive Autism Network (plus look on the left menu and read all the sub-menu items for Aspergers).
Also, scroll down on this link to near the bottom:
Intelligence in autistic people can be highly polarized; both intellectual disability and giftedness are more common in autism than in the general public.
embrace-autism.com
The distribution of IQ among the autistic population actually has a much higher percentage of gifted (IQ > 130) than the general population.
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Social interaction and lack of the ability to form attachment to other people is the most defining characteristic of ASD, not IQ.
The list of geniuses that are suspected or confirmed to have Asperger's is just down right impressive: