Wind resistance and drift would be a huge issue at that distance and I bet the arrow trajectory is almost verticle by then. I expect he can press huge draw weight with his leg and back- both are bigger muscle groups than shoulder and tricep. Hopefully a major company will sponsor him and design a customer riser for his shooting style. I am sure he could do better with a bow that actually fit!
_________________________
In the legend of King Arthur, the Fisher King was a renowned angler whose errant ways caused him to be struck dumb in the presence of the sacred chalice. I am no great fisherman, and a steelhead is not the covenant of Christ, but with each of these fish I am rendered speechless.