I’m pretty sceptical of the “cures” people like Dizpenza claim. But I do know that meditation in general is known to reduce stress, which is good for anyone and everyone. I highly doubt he healed his broken bones from meditating but I do believe releasing stress would help tense muscles and the perception of pain levels. For anyone who hasn’t tried meditation, try it why not? It might help your stutter if it worsens with stress. If guys like Dizpenza are asking you for money though, buyer beware.