Everything people like Sinclair state should be taken with a grain of salt (as even his peers say he's guilty of making excessive claims) but it's forward-thinkers who change the world, not people following others' steps and afraid to take peek outside their box.
Maybe the guy will achieve something real in the field and maybe it'll be the next guy. No way to know. But I'm far from dismissing someone just because their opinions are not in line with popular knowledge. Boltzmann, Galileo, Copernicus and Wright brothers were discredited or ridiculed.
It appears that people fall for his niceness is my theory about him. And no doubt he is a nice guy. It's just that his explanations lacked the rigor I generally look for.