No, that's not sound. We're talking about humans. There are lots of little people, and people with dwarfism, who are weight lifters and body builders. Some hold records (and don't cut this sentence and reply to just this portion because the remainder is relevant to what I just said). It's not some anomaly, there is no height to strength connection for humans aside from width, muscle mass and weight, all of which can vary regardless of height. A taller lifter may be better at certain lifts while a shorter lifter may be better at other lifts, but there is no overall connection between being short and lifting less weight in itself. In fact in terms of actual physical ease for lifting weight, a taller lifter has to work harder because they have longer levers which is a disadvantage in lifting because they don't get to use as much leverage to help with the lift.