He sounds good to me, but I am in no position to diagnose since there can be more than the dysfluencies in his speech. Check out the Iceberg Analogy of Stuttering: [http://istuttersowhat.com/the-iceberg-analogy-of-stuttering/#:\~:text=The%20iceberg%20analogy%20of%20stuttering%20was%20first%20discussed%20by%20Joe,portion%20below%20the%20water%20line.](http://istuttersowhat.com/the-iceberg-analogy-of-stuttering/#:~:text=The%20iceberg%20analogy%20of%20stuttering%20was%20first%20discussed%20by%20Joe,portion%20below%20the%20water%20line.)