Note that at shaft parallel it may appear that he gets the club head past the hands - too shallow, too soon. Don’t do that! At shaft parallel the club head should be a bit ball side of hands.
The Drill - Follow Through Drill - shaft and arm parallel (10:50)
Keep club face quiet through impact
Shaft of the club has not overtaken the lead arm.
Club face straight up and down - feel a small adjustment as needed
Grip (17:30)
Personal feeling of what you need to square the club face at impact.