With the standard caveat that I haven't seen your child in action, and thus have no naturalistic or clinical context for the scores:
I would agree that the picture concepts score is anomalous. Given his existing ASD diagnosis, it is not unreasonable to suspect that there is some social reasoning component affecting his performance. Other kinds of divergent thinkers also sometimes score lower, as they may find connections between the pictures that are different from the standard responses. Digit span also is quite a bit lower than LNS. I wonder if digits forward and backward were comparable to each other, or if one of them was more similar to LNS. DSF is more rote memory (more sensitive to attention), while DSB has a bit of visual component to it, and tends to be more interesting, which sometimes elicits a stronger performance from those with ADHD. The Cd/SS difference is also notable. Typically, this reflects fine motor issues, but I would have expected a little more of that to show up on BD as well. Was there any commentary on how he completed the tasks? I've also seen children who were overly focused on perfect renditions of the symbols on Cd end up with lower scores. Also people who have difficulty with looking up and down repeatedly, for near-point copying (often having trouble finding their place again after looking away).
Do you have achievement data? A WIAT, WJ, or KTEA? One of those should have been done at his last reevaluation (probably when the WISC was done).