I disagree with pretty much all of that.
Pivot happens after the drive. Picture a sprinter in the gates...
Hand placement... if the palm/ball is facing 2nd base at the top of the circle, that means the elbow is probably locking straight out, so the pc is most likely teaching hello elbow snap and not a whipping ir motion.
Do yourself and your dd's a favor by simply comparing what this pc is teaching vs. how the best pitchers in the world are pitching. Study Boardmembers posts in the ir forum and google Bill Hillhouse videos. Follow those two and their style and you'll see real quick if your pc is a moron or not.