Looks to me like he has the shoulders turning on less flat a plane (slightly, more 'under the chin'), which helped get the arms and body to work together more and not get the arms lifting and disconnecting from the turn.
Headcover under the lead arm might help you out Hue (for 1/2 to 3/4 hip to hip punch shots, use your 160 club, hit it 100)
You need a 'touch' more 'around', not much - but that drill will help you get there
get those shoulders under the chin back and through and 'let' the arms follow - they will be slightly flatter relative to your shoulder plane, but closer to the same club/ball plane that you are on now - gets the body in a better position to come from the inside, to square, to inside
let me know how this goes