What's your take on William Parry?

What's your take on William Parry? I stumbled upon a replier in another post who incited Parry's vid to inform us of the fact that stuttering is now seriously under researches and I found out Parry's strategies of overcoming blocks and researches about the cause of stuttering(hyperactive amygdala) were very stunning: [https://www.youtube.com/watch?v=AcNibr3ulVg&t=718s](https://www.youtube.com/watch?v=AcNibr3ulVg&t=718s) I only watched a small part of his vid, and his tip was 'Natural fluency can not be forced. Don't focus on fluency, instead, on melody.'