I never heard of this before but spending a couple minutes looking at their website looks like completely bogus science, not only they claim to cure stuttering but they also have programs such as “Vision Recovery”, “Autism”, “Breast Cancer” and of course “Covid-19” so I bet doctors and psychologists hate this trick. There’s not real evidence offered whatsoever other than “the reviews of our users”. I would stay away from this scam and stick to a different approach