Michael Williams, a real cured stutterer?

Michael Williams, a real cured stutterer? Hello, I came accross this videos from Michael Williams: https://www.youtube.com/watch?v=HpHqvwHqPLk&list=UU0NyOM2sMFocgPlR5EzzAug&index=32 He says he was/is a stutterer that has developed a method to actually cure stuttering. When you listen to him speaking you really can't tell he even stuttered one day. Is he a real stutterer, did someone see him ever stutter?