1) everything he eats, and I do mean everything, seems to be spectacular. He never goes to a restaurant and finds it disappointing?
Maybe this is one reason why he is so popular? He is closing in on 4 M subs, it seems like only last year he went over 1M. He is genuine, real, upbeat, open, honest, and that comes across to many folks.
Further, I suspect he susses out the best spots, and doesn't see himself as some anonymous food critic who has to review any old spot.
I follow a few other very popular Thai food vloggers and they tend to be positive in their reviews as well.
Finally, the local defamation (and computer crimes) laws can be liberally applied to anyone, especially a ferner, so maybe best not to put yourself in a position of trashing some resto?
Paraphrasing that old doctor/patient joke, if it hurts to watch his videos maybe best that you don't watch them?
My only beefs with his "style" are that he still doesn't have a grasp on basic food/taste descriptions, and he is veering into the freebie/sponsor area (which certainly results in positive reviews) a bit too much. But not sure I can blame him for getting free business class air tickets, free hotel rooms and getting his meals comped; I'd probably do the same thing. For the most part, he mentions the comp/no comp thing at least once in a review.