First, I'm not a certified dog anything. Nor do I have a degree in psychology. Yet, even I can understand the basics of operant conditioning. And, it would appear that there is a lack of that understanding in the Koehler Method. Hanging dogs until near death, physical pain, these only produce a dog that either shuts down, or bides it's time until it can retaliate.
BTW, I used to scruff and pin. And was lucky. First, I never did it to cause pain, which limited it's value as a true punishment. Second, since it didn't cause pain, my dog viewed it as attention and would lower and roll, offering appeasement. And, it only stopped the behavior at that moment and it didn't train. I did pin him forcefully one time. He was attacking my in-law's geriatric Lhasa Apso. He left her alone for the rest of the visit. Next visit, he did it again. Therefore, even the forceful pin, eyelock, and loud, low "no" didn't do squat for stopping the behavior. What has worked far better is commanding incompatible behavior that is postively trained. I use +R because it works, not because I'm afraid to scruff and pin. And +R works more effectively. To the original poster, don't go to the Koehler method.
And, in my humble opinion, a dog that is not responding to +R is not going to respond to corrections, either.