Well I doubt he will have issues fixing it, but these conspiracies sound about as crazy as some other ones floating around. Nobody "wants" to blow their car on purpose....the reason for the people being around was for his first "Gumball Rally Style" even he was having, complete with POLICE escorts.
As for the car blowing ? Who knows. It is cooler, and if he was running more boost, maybe that did it. Lots of things when you mod deep into the car, but as it been said, his channel is about his cars. He makes his money with the cars. So he needs his cars to run.
As for what he is doing ? Well more power to him. If he has found a way to make money talking about cars, well good for him. I do not know him, nor have met him. But this is the new age in how to make money. If he is successful at it, I will not knock him down for it. You Tube is like any other business now. It's just a new way of doing things whether people like it or not.