Sort of.
He spars, but with guys he can work with.
So Joe Schilling is his major sparring parter. Do they go hard? Sort of. Do they spar for knock outs and K.O.s not so much.
It helps if you are in a position to choose your sparring partners. Or a gym culture that promotes this. Especially as you get on and are looking at longevity.
But say for example you are up and coming and have made it in to Tiger muay thai or something. You would just have to bite down on your mouth guard and put up with it.
So yeah. The best option is to own your own ranch and then just invite whoever you like to train with. That way you get quality guys without having to fight the occasional egomaniac.