Horrible (with a French Accent)!!!!!!
Now I am not advocating pulling your right (back) heel off the ground, but trying to actively keep your right foot flat is another invented, restrictive action.
Anything that restricts natural movement of the body is going to cause you problems…both with your swing and physically. Keeping your right foot flat on the ground on purpose is going to restrict your hip turn coming through impact.
Don’t take my word for it. Try and rotate your hips as they would work on the down swing while trying to force your back foot flat and see what happens. See how that feels and torques your body.
I have the new swing theory that will make me millions. Restrict the hip turn on the back swing (ala Jim McLean’s X-factor) and force your back foot to stay flat on the downswing and you can make a golf swing with no hip turn at all.
I will make my millions by getting kick backs from all the surgeons I will send people to after they ruin every body part from the arm pits to the ankles.