This 100% horse shit, or just surprisingly clever trolling. I used to box many years, sparring 12 rounds every thursday. What ”discombobulates” fat is the insane amount of cardio at the very near and above your top heart rate. Exercise where you are punched to the stomach repeatedly is to learn how to flex your abs so that you are not dropped with one hook to the belly. And there is plenty of fat boxers, just look at Tyson Fury or Andy Ruiz Jr.