He looked identical to Klitschko's height, who was also 6'6. He looked a good few inches taller than Dubois who is reported to be 6'5 (I think he's got to be less than that). He looked about the same height as 6'6 Helenius. He looked about an inch shorter than 6'7 Wilder.
I'd say he has a fairly accurate height, assuming all the others are fairly accurate as well.