I answered that just before - you're repeating a non-argument "does nothing".
Do you understand the simple relationships below? Which one specifically are you saying does not occur when tipping a lifted ski?
First, you have to do these very simple tests... to understand the bio-mechanics involved. All you need is a beer in the right hand and some props, in the form of skis and boots, which you may have to borrow, according to some. Snow is optional.
Put them boots and skis on and while firmly planted on an immovable right leg, do the following with the left foot lifted a couple of inches:
1. move it to the side, far from the right and try to tip it to the left. Then move it close to the right and try to tip it to the left. It will be much more easier to tip when closer. Leave it closer from now on, duh!
2. push it forward as much as you can and try to tip it to the left. Then pull it back so it matches the right boot and keep the knee flexed to lift it couple inches, and try to tip it. It will be much easier to tip and with a bigger range of motion when pulled back.
3. push it forward and tilt it back - you will notice your upper body moving back and it being impossible to tip the left boot. Pull it back like before but also tilt it forward, flexing the knee, as if to put a tip on snow - you will also notice the upper body moving forward and it being much more easy to tip, with a bigger range of movement.
4. put weight on the left foot and tip it. Then relax, flex, even lift it and try to tip it left. It will be much more easy to tip when the leg is flexed and lifted.
Reverse engineering these, you can see how simply focusing on a strong and good tipping of the inside ski will achieve not only parallel shins, but:
- narrow the stance, keeping the boots together and to the side, edged and not under the body like in zenny's video, so you can commit to the outside ski - also have both on edge and carving together and not steering themselves out of carving
- flexing the inside leg, putting more weight on the outside than otherwise and making room for the hips to move lower and in
- pulling it back and tilting it forward, which will put more weight on the front of the outside ski
As any coach can tell you, when you can commit to the outside ski, with more weight on it than the inside and with more weight on the front of that ski (i.e. the shovel) and when you can edge it more you will have stronger engagement of this outside ski than otherwise.