He's actually obese, not just overweight. Even 236 pounds results in a 30.3 BMI, which is classified as obese.
BMI isn't really a good measure for tall men. I think most people would say 6 feet, 200 pounds is pretty standard, but that is a slightly overweight 27.1. My height and weight leads to an obese 37.4, but I'd just call myself ordinary fat (6'5", 315 lbs). There should also be a gender adjustment to the formula, because a man of a height will weigh more than a woman of the same height, but there isn't.