Welcome, Zylona!
If I am understanding correctly, your child had a WISC-V administered at age five as part of a medical evaluation. In this case, I would be in agreement with their decision to withhold the scores, since, as you accurately note, he was outside of the age norms at the time, so those scaled and standard scores are not valid, and cannot be responsibly reported. They can reasonably conclude that he is at least age-appropriate in ability (if the nominal standard scores are at least average), but not to what degree. Unfortunately, this has also spoiled future administrations of the WISC-V for the next 24 months.