This is thousands of times higher than the general population, but still the exception rather than the rule. I had some savant abilities when I was little, but they faded as I learned to communicate. I know at least two autistics who have used their savant abilities in employment situations. Well that's news to me. I know some definitely autistic people who learned to speak very early.
Autistic people appear to have a full range of intelligence.
My own IQ has varied over 100 points. Later, all my problems were written off as part of being gifted. IQ testing is not a useful measure for autistic people, if anyone. On a related note, autistic people do tend to have more than the normal difference between our skills and deficits. Ability or inability in one area should not be considered indicative of overall ability or applied to any other area.