Well, he cannot have both, but he may have received both diagnoses at one point. For example, I was first diagnosed with Aspergers before being diagnosed with Classic Autism. So, I technically received both diagnoses even though I cannot have Aspergers Disorder. Is this perhaps what he meant? That he had received both labels over his life (maybe he had PDDNOS label, but then with further evaluation, they realized he fit the Aspergers diagnostic criteria for example?) If he says he really has both PDDNOS and Aspergers (rather than just one label given and then another replacing the original label), then he is wrong as that is impossible.
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Diagnosed with classic Autism
AQ score= 48
PDD assessment score= 170 (severe PDD)
EQ=8 SQ=93 (Extreme Systemizer)
Alexithymia Quiz=164/185 (high)