Hi
Already wrote about this in the Youtube commentary section "THIS is the BEST SECRET to Incredible Ball Striking (Move Your Wrists LIKE THIS)" and i will also copy it here. For me this made a world of difference to my downswing. I have to force this to happen because until now my "release" pattern has been wrong, either a flip or roll or both.
I saw few similar posts about this same topic but i will share my own thoughts here, hoping it might be of help to someone.
"This was a real eye opener for me. I have had trouble squaring the clubface, even with bowing the lead wrist, i just couldnt figure out how in the world i can get the face square at impact, constantly hitting to the right with an open face. Only way i got the face square was to bow and rotate my forearm closing the face, but the shots were too low and too much shaft lean. i watched this video again on youtube that you made "You Need to Know this Shocking TRUTH About Your Grip to Hit Consistently Solid Golf Shots". At one part you said that pointing the club down by unhinging the wrists squares the clubface. At first i didnt believe that how can that be possible. Then i revisited this video and tested myself and it really does square the face. Now i can finally start my dowswing by pulling the butt end off the club towards the ball letting my body move along and then release the wrists down at the hitting area and keep moving my body through the shot in sync and be certain that the clubface will square itself. This also creates huge amounts of speed. Also now the followthrough starts making more sense. If after impact i continue to point the club down constantly i get that short finish arms straight and flying wedge intact. If i sort of let the momentum go and dont force the club down constantly after impact, my wrists rehinge and i get that proper finish position. This truly is in my opinion one of the best tips ever, because it teaches the proper way to square the face without the need of timing it all up.
My brother, whose backswing position was perfect, started downswing with rotating his body and internally rotating his trail arm and casting the club (this was his way of squaring the club). I told him this same unhinging move to square the face and it fixed his whole downswing. Now his trail arm stays tucked, he tilts his body and wrists release properly with a square face. Everything achieved with only this tip :)"
For me, I follow the "Magic Elbow" and adhere to Tom's backswing baseline of connecting the left upper arm to the pec area on the takeaway. After that the rest is almost "automatic" unless I lose connection during the shoulder turn and start arming the club to the top. As such, I don't think about internal/external rotation details. If I do start questioning those details, then I bet I'm starting to apply needless leverage (arm swinging, or excess wrist movement) by mistake somewhere in the backswing or downswing.