>>76353162 (OP)i did something similar to your picture and its harder than you would expect. your stomach has a set size and doesnt expand much, i looked it up afterwards and its about 2 liters for a very decently sized one. basically that its hard to eat more than 2 liters of food faster than your stomach can empty its self
obviously though pro eaters trained their stomach and so can everyone else if they so wanted to