He does a great job breaking your delivery down. I also noticed the grip on the baseball. Too me way to far back into the palm. Does not let the fingers “work” and put more spin on the ball.
Look at Pedros grip. See pretty good space in the “C” between his fingers and thumb
The only point I would make is your front side. Your front elbow (direction) never gets pointed at the target. In the above link, look at Pedros head, shoulder and front elbow. All pointing at the target.
If you look at the video around the 3:20 mark and on as he goes through your body movement you never get your elbow to point at the plate. I personally like a higher glove hand that is “open” to first base (right handed pitcher) with slight elbow bend but with your head, shoulder and front elbow all being lined up and targeting the plate as though you were looking down the site of a rifle.
We teach to reach out and grab a knob on a door/window that is above your shoulder at your eye level and then “open the door” by twisting the knob and then pulling your chest through the door/window or pushing your core through the open door/window. (Some guys are glove side pullers and other are chest pushers - which ever you are - make it work)
All the rest of the stuff he says is correct. But he never mentions your front side dropping and never quite getting to the plate. As you watch from 3:20 to about 3:50 you will see your elbow drop as glove tucks towards hips. I think if you can get that glove side more pointed towards home and get your arm angle higher before core rotation you will add MPH to the velo.
If you look at the other player in comparison around the 3:53 mark, you will see glove side still high and elbow pointing at the plate. That force that you will create by bringing your glove to your chest (or your chest to your glove) will help get another couple MPH onto that ball.
I also think you look as though you pronate a touch early. That may be causing what he talks about in the last part of his breakdown. It is really hard to tell because we can’t stop the video exactly where we need it to see exactly.
Remember, you want your foot plant to “trigger” things in a sequence. You want that to fire your hips, then your core, your shoulder, your elbow, your wrist and then your fingers. I try to get my players to think of the last two motions as “slapping five with the catcher” and then “poking him in the eyes” with your middle and pointer fingers (4 seam FB). This will in essence keep your wrist pointed at the target at release with the proper hand position of behind and on top of the ball and then will get your fingers working correctly to put more spin on the ball, which effects how the ball flies through the air.
Overall your delivery looks pretty sound. Best to you and keep working!!!