It looks to me like the hands push to the ball because the upright posture remains constant throughout the swing. He looks a bit "confined", jammed, bunched up at contact.
I would have him try to get his upper body to lean more over the plate and maintain that position throughout the swing. From there, he can do more of a torso turn to bring the hands and bat down to the ball and not have to push his hands to reach. From this upright posture, his torso/shoulders are turning on a plane that is much higher than the ball... hence the need to push the hands down(disconnect) to reach.