I think there's lots of anecdotal things like that which can work for certain individuals. If you have a psychological stutter I think some people can placebo themselves into being cured or close enough to it. And of course they'll be super evangelical almost about because they just want to help people. Sort of like an addict that goes to some spirit healer and believes they've had an addiction component to them removed can before successful at breaking the addiction. If your stutter is neurological or you are a skeptical mind like me. I don't think anyones non peer reviewed, repeatable treatment is going to have any affect.