I don't really disagree with you, although some Autistic people have above average scores on all verbal and visual IQ tests, while still having a discrepancy between scores. Most high functioning Autistic people do have significant deficits on specific sorts of intelligence tests, but they make up for it by having very superior skill on other specific sorts of intelligence tests, which balances out their general IQ (or even raises it to above average). High functioning autism is sort of like being a genius at specific things and retarded at specific things at the same time. Most people are average at everything, and have an average GIQ. High functioning autistic people are more likely to be really good at some things and really bad at other things, and have an average GIQ. Low functioning autistic people tend to be mentally retarded on all tests, but have a discrepancy between subtests, whereas someone without Autism but with mental retardation would score about equally as low on all tests.