Taking that result at face value (which isn't a given), my comment would be that yes, ADHD can affect comprehension independent of decoding skills, mainly due to difficulties in sustaining attention throughout a passage, and organizing information into a cohesive whole, both usually in order to make inferences. Some forms of dyslexia can also affect comprehension through reading fluency deficits, even when untimed decoding appears intact. These tend to affect both literal and inferential comprehension.
In addition, some children combine high or average verbal cognition with expressive or receptive language disorders (counterintuitive, yes, but it does happen).
What sort of assessment tools did the evaluator use?
