Eh, self-deprecating jokes are in fashion right now, I mean this other streamer called CaseOh got big because people would make fun of his weight and he would lean into it. The main difference is though, white people have more of a variety of individuals representing them in media, meaning when a white person is presented, people don't immdiately conclude that person looks like CaseOh.
In our case, we don't have that large of a variety of different people doing different things in the mainstream media, that's why you'll see comments comparing any slightly overweight somali with chunks and every skinnny somali with AJ.
All in all fair play to him, I'm not gonna hate on him doing his thing. He's actually getting really popular off this.