Imo the reason he's being so aggressive is in the title of his video. Garrett is trying to create a toxic vitamin A "FAD." This interloper Stephens is also trying to create a fad. He can see this guys fad is competing with his fad which takes money out of his pocket and that's what this is all about.
Will Stephens issue a statement? Why not demand an apology? He's being accused by Garrett of lying to make money on camera. He's called him a "shyster" which is a crook on camera twice. That's pretty serious.
Regardless of what you think of Garrett, he's not dumb enough to make these claims if he doesn't believe they're true because he could get sued. Dr. Stephens is not a Youtuber, he's a practicing psychologist. I think if he had any doubt that Stephens was a phony he would be afraid to attack him in this way but he's continued to research his background and former clients since last week and has tripled down with his attacks.
I will be putting off ordering my 50lb sack of corn sugar until I'm certain that Stephens research is genuine because I don't want to be tricked into getting diabetes. But best of luck to everyone giving it a go. I hope it's for real.