I forget where I read it, and searching google only brings up " how many calories do you need to eat to gain a pound" (fuck google) but IIRC it takes 3 calories a day to maintain the cells in 1 pound of fat. So if you gain 100 pounds you will need 300 more calories a day to maintain that weight.
Muscles, OTOH, take 14 calories a day to maintain 1 pound of muscle mass. Not putting on even 50 pounds of muscle mass is a MAJOR undertaking, but healing said muscles after a workout takes a shitload of calories, which is why muscle building is now being seen as a key to maintaining weight loss. It's also why 600 lbs heifers take SO many calories to maintain, not just the huge fat mass but underneath the ones that are still mobile have a ton of muscle mass, and if you took just that muscle mass and put it on a normal person that would be freakishly strong, the amount of muscle needed to lift and walk 600lbs around cannot be understated.
The other thing limiting his weight gain is frequency. He eats more then Chantal at times, but he uploads muckbangs MAYBE once a week. Chantal and other super-fatties eat like that multiple times a day. I wouldnt be surprised if his digestive system still cant handle mukbangs even one a day for several days in a row yet, but he is working his way that direction. If he has to take a day or two off from eating after a mukbang video, or even only eats lightly, that would significantly limit weight gain.
