DerekMoors: Several things wrong with that
I think you're correct on all of those points. He also has another potential problem with doing this- some cults are aggressive towards their critics. How much can he say about Scientology, for example? If he gets enough traction, he will find himself in their crosshairs and they will happily put his embarrassing past on full blast for everyone to see. And good luck filing a criminal lawsuit against them in Croatian court!
He will have to restrain his content and his reach in order to avoid having his past waved in his face at every opportunity. So his choices are to remain a small and insignificant channel, or spend most of his time getting absolutely roasted by the very cults he is trying to expose. I openly encourage him to take the latter route.