I don't see the problem.
dude's 220lbs and bottom heavy. Tyson's thighs are/were always much larger than the guys he fought.
look at his arms, they're boxers arms, not bodybuilders arms. all biceps and no triceps. so 16" seems right and I recall seeing those same #'s on Tyson on many 'tale of the tape's". I'm guessing the 19in calves are a typo, most likely 16inches. 16in bicep on a bodybuilders arm doesn't look the same as a 16" boxers arm.