At first I was thinking “Here we go again… 11 yr old allegedly throwing 60+”… Umm, he is bringing it. Great to see an athletic kid that pitches w/ intent.
He’s explosive but under control. Keep him healthy & dont worry about velo, just accuracy which it seems you understand.
I’ll let the gurus jump on the mech advice… with a kid like this I’ll just add that you want to keep it fun & read up on arm care, pitch counts, rest between outings & seasons, throwing programs, when to start & better yet when not start with breaking balls etc…
He could be devastating with a low 50’s change up… I hear knees buckling already!