Eh I dunno aren’t most martial arts made up bullshit that only works in the limited constraints of the sport? One well placed kick to the nuts and he’s gone.

Most martial arts, maybe, but Brazilian Jiu Jitsu is not included in the list of made up bullshit because it’s one of the few where you regularly spar with fully resisting opponents. There are legitimate criticisms of BJJ and it has limitations like every other martial art, but it’s very far from being bullshit.

Edit: also, most legitimate, traditional martial arts are not bullshit either. They tend to be somewhat less effective than the ones where you train with fully resisting opponents, but there are still fighting skills that can be learned from them.