Luke Wilson is listed at 6'9 255, Arinze Onuaku was listed at 6'9 261, Rick Jackson was listed at 6'9 240.
While I agree listed heights and weights are often made up number, just like vertical leap and 40 times, they are all using the same made up number. You can't say he is "shorter" than them unless you think Appalachian State lies about height more than JB's teams from two decades ago.
I personally think they are all likely shorter than that... But isn't everybody shorter than their listed height?