Personally I hate these wonder sealants and additives. About the only one that ever works is Wynns Hydraulic Lifter Treatment. You can keep all the other snake oils.
As for that video I have watched a few by him and it seems the louder he shouts the more he seems as if he is trying to con you. Also he claims he puts it in his own car being a Toyota Celica, then at the end is seen driving off in a Ford GTO. He has a couple of good ideas, but a vast majority of them are bad ways of corner cutting.