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I know. Im just wonder how it is diagnosed if he is socially perfectly normal!!
To try to answer your question;
When I was tested for Asperger's, the psychologist didn't really look at my social skills, or how "normal" I appeared, instead, he guided me though a series of small tests that each tested a different part of my brain. The tests where things like pattern recognition, memory, creativity, problem solving, reading/spelling and maths. After the tests were over, he told me that with people on the spectrum, different parts of the brain don't communicate with each other fully. This meant that if I had Asperger's, the tests would come back showing significant differences between certain tests, ie; I'd be great at one thing but absolutely terrible at another. And sure enough, the tests came back with very significant differences indeed.
Perhaps the guy in the video was given a similar test. It did seem like the best type of test for Asperger's in my opinion, as it didn't focus too much on social skills that I may or may not have learned over the years.