I read somewhere that it is a symptom of a certain type of artificial muscle-building drug that goes overboard on the chest muscles but that was a reddit comment from a while ago so its probably bullshit.
If you watch his latest appearance on Joe Rogans podcast, he actually looks like a normal human. This picture is probably either really just a bad angle, or it's been photoshopped.
i have a similar build to him and when i cut out enough carbs for long enough; i look like him; when i don't, i'm just plain old good fashioned fat.
you know he's cutting out the carbs/fat because there's not much back fat; but the chest still sticks out like he is still fat, as it does on me; i would sympathize with him if we wasn't one of the richest men on the planet and a raging asshole at the same time.
When this picture was making the rounds, someone complained that sharing it wouldn't have any impact on the wealthy and powerful, but would make average people with the condition self-conscious. I'm glad that that was not an absolute truth!