That's funny... my old gym full of hardcore Olympic lifters (who competed at a national/international level) often ate candy and drank sugary energy replacement drinks throughout their workouts. I never once saw them snack on rice, potatoes or chicken. Lol. You have some pretty black and white views on sports nutrition me thinks.
Pre workout for quick energy is an obvious one, but he said going full on on 700g of sugar per day looking for refill muscle glycogen.