I didn't learn about this until Asha was grown and I've still never done it as a training method. But this:
^^^ this is exactly what I would expect would happen with a high drive Dobe puppy. I haven't read the method for a year or two and can't remember if it's important that they are close enough to bite shoes... I could see myself getting a 50 lb bag of sand in a plastic bucket and putting the leash under that instead of under my foot and put it and the pup just a few inches further than where it could reach the chair or my feet.
And patience. 10,000x more patience.
If it works for you and your dog that's great. My dog will be still and stare a hole in anything that might bring her that prize. But I'm one of those who hate a dog staring at my plate or at me while I'm eating, so I'd never start that habit. From day one, Asha was never allowed to be close to the table while we are eating - as a youngster, she was put in an X-pen where she could see but not be under foot, then when she knew place, she was expected to stay on her bed in the living room - in sight of the table about 10 feet away - while we ate. She learned that she never got anything and now when we serve our plates she retreats to the bed, knowing that nothing will happen with her again until we clean up the dishes.
Edit to say, we go to many patio restaurants and she lays at my feet and never stares at us eating. And yes, I do occasionally give her something off my plate at home or eating out but because it's not part of the routine, she doesn't expect it and isn't looking for it.