Ok, I just watched the video by Chris. Here are my thoughts.
He references that this is a similar gripping method that he uses with a semi-auto. I also shoot both styles, as do many of us. Each type is built differently, and the physics of recoil are entirely different. In my opinion, trying to use the same gripping method for different physics isn't the most efficient method.
His reference to the "shroud" is actually part of the recoil shield area of the frame. By placing your thumb against this area may not work for all as each person's hands are different sizes, and as such, may not be as "controllable" as it is for him.
Next, by placing your thumbs in that position, your gripping is an "open hand" style, while more traditional gripping allows more of a closed hand.
Lastly, if you want to see the best,,, look up Jerry Miculek. He can run the pants off anybody in the world with a DA revolver. Look at his gripping method, and how he does things.
But,,, not trying to dissuade anyone,,, I say "try it" to see if it will work for you & fit your hands.