I have worked with bona fide geniuses enough to know that I'm not one. They're on a totally different level. I have no idea whether any of them were AS or not.
Personally I suspect that AS can be geniuses, but that AS are no more likely to be geniuses than NT, but I have nothing to back that up.
Breaking it down further, there are three possible cases:
(1) AS and genius are not causally related.
In this case, we would expect the percentage of geniuses who are AS to be the same as the percentage of non-geniuses in the population who are AS.
(2) AS can be a cause of genius.
In this case, we would expect more geniuses to be AS, and more AS to be geniuses. It would mean something about AS causes higher orders of intelligence.
(3) AS precludes genius.
In this case, we would expect few or no geniuses to be AS. It implies that AS is a type of mental retardation which prevents higher orders of intelligence.
Looking at AS who I know, it would be tempting to lend credence to #2, but I don't think so. Some AS enjoy a high degree of focus on specific subjects which leads to increased practice in that subject, and sometimes even expertise. I think that can lead to AS seeming more intelligent than they actually are. If anyone, AS or NT, works hard and enforces the self-discipline to stay focused on a subject, they will enjoy greater command of that subject. This behavior simply comes more easily to some AS, and it has nothing to do with intelligence.
Some people would find #3 compelling, but I think this is based on the "halo effect", a logical fallacy which is the core of many misunderstandings. The halo effect causes people who observe good traits in people to assume they have other good traits not in evidence, or when they observe bad traits in people they assume those people have other bad traits not in evidence. So when people observe AS behavior they deem bad (such as antisocial behavior, incomprehension of social norms, or taboo behavior like stimming), the halo effect leads them to assume the AS is bad in other ways, including low intelligence.
As for case #1, I have no evidence to prove it or disprove it, it just seems likely to me.