Did the professional(s) use the DSM-III or DSM-IV(-TR), ICD-9 or ICD-10, Gillberg's criteria or another set of criteria?
About the last option:
Most people were officially diagnosed by the use of 1 set of criteria, but some may have been diagnosed with classical autism or PDD-NOS before AS existed yet and may have gotten their official diagnosis changed to AS after 1992/1994. Some might have received multiple diagnosis too.
I myself was diagnosed with Asperger's Syndrome by use of the ICD-10.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett