Note that his strongest area (which is in the GT range) is in abstract fluid reasoning (FRI). Long term, this is one of the better predictors of conceptual and abstract learning abilities. It is markedly stronger than his other indices (by 16 - 37 points), which suggests that the FSIQ and GAI are probably not the most comprehensive representations of his ability. In addition, WMI is similarly markedly weaker (17 - 37 points), likely because of unmanaged ADHD symptoms. I would agree that it is possible that retesting after a couple of years of more effective management of ADHD (whether through medication, self-monitoring strategies, or maturity) may find much higher scores all around.
Whether he ultimately falls into the GT classification or not, he is clearly a highly conceptual and abstract learner, who is likely to benefit significantly from careful attention to just-right challenging instruction in the zone of proximal development. As much as GT learners need challenge, ADHD learners also need it, as they tend to be more successful with engagingly-difficult material than with too-easy material, that cannot grab their attention. If he happens to be 2e/ADHD (both GT and ADHD), then appropriate challenge will be doubly important for him.