I agree with OP that stuttering can be cured. The human mind has the potential to reach entirely new ways of thinking, and find meaningful resources such as confidence, acceptance, and peace. We must dig every single day into our mind to find what it takes. This is at least true for people whose stuttering is caused by panic induced muscle tension. We just need to create a new mental program for ourselves that leads to muscle relaxation rather than tightness. That is the key and I believe it can be done. Though I didn’t listen to the videos yet, I think whatever we program our brain with it should lead us to decreased muscle tension.