This is a good way to teach a dog to resource guard.
I'm seriously not trying to be unkind but so much of what I'm reading in your posts are huge red flags. It would be great if you could enroll in a puppy class in your area, one that uses current methods.
I think you just misunderstood what a.baker meant. Didn't she mean she withholds the rewards and scolds? Not that she takes food away from the dog once it's given?