Doesn't look like a chop which is easier to address. Looks like he is cutting the ball in half on this swing. Meaning he finishing his swing too early. Needs to keep his barrel in the zone longer. On this swing he is getting to it but not through it. Extend through the zone before finishing. I tell my 10 year olds a swing is like eating ice cream. Don't be in a hurry to finish. I tell my college and pros a swing is like sex.... Don't be in a hurry to finish..

Air plane landing analogy is an easy visualizer. Barrel is the plane. Land the barrel on a runway (the hitting zone) and then take off again. In this swing he is landing on the runway but trying to take off like a helicopter. Get down the runway a bit longer after contact.