His testing does not support being gifted (the GIA is 109), but it does support weaknesses in fine motor skills, fluency skills (both motor and motor-free), and receptive language, and exceptionally good phonological processing, in aspects of phonological awareness and phonological memory. His outstanding PP skills are likely behind his strong word-level decoding (reading) and encoding (spelling) skills. Comprehension, however, is only on par with his assessed cognition (which is what I generally expect). Some might say this is consistent with the hyperlexic presentation that is sometimes associated with autism spectrum disorders. The fluency weakness (especially in both motor-involved and motor-free conditions) is not an unusual finding in dysgraphics, as it is one of the core deficits.
Regarding ASD, though, the more important assessments--beyond establishing normal or above cognition, to rule out global developmental delay as an explanation--are those having to do with reciprocal social communication and interaction, and restricted/repetitive behaviors. The WJ does not address those areas of development. If you wanted ASD assessment, you would have needed some additional instruments, interviews, and observations. The ADOS-2 is the gold standard, but some survey instruments can pick up valuable information, like the GARS-3 or the SRS-2, both designed for assessing autistic-associated social communication behavior and RRB.
