sometimes it's not about being fat or trying to lose weight but I agree the author doesn't know what bulimia is. It sounds like he has binge eating disorder which is more common in men too
He has bulimia Nervosa, and part of that is binge eating. So I think the author know it but focusing on MMORPG rather than the mc disorder. But you can see how minhyuk keep eating nonstop and will do everything to eat. They just make it lighter disorder rather than how bulimia is really extreme and hard to cure in theraphy
Bulimia Nervosa is a serious eating disorder that keep eating and cannot stop, because of binge eating they tend to throw up.
Also the vomiting part tend to be a female mental health who has bulimia because they can't stop eating and insecurity rise them and they keep vomiting and then they eat again. It is serious cycle.
I think the author of this manga doesn’t know what bullimic means? It means that you always see yourself fat and binge eat then throw it up. Not just keep eating even if you’re full.