I'm going to shake some trees here but what the heck, I feel like it's time to throw out an idea.
To my eye the video doesn't show static skiing, nor is it as lifeless as some might suggest. Here's why I say that.
First and foremost the subject of getting the body aligned over the skis and doing so in both lateral hemispheres and along the overall balance axis is quite obvious in the video. After all the subject is stacking and Darren makes it clear that the demo is being done to show exactly that. So when it comes to whatever might be appropriate in another situation seems a bit irrelevent to the specific situation and task Darren is discussing.
Second is the idea of a lot more discipline and a strong focus on eliminating extraneous movements. What's left is what we see in the video. To some it appears like more hip angulation, a more countered stance, and a more one footed stance might be added but I would question the need to change anything in the video. The skis are working quite well and in the end that's what matters most.
Third is the idea that Darren's skiing somehow needs to adhere to one system's template of what represents a best model. I noticed the focus on the idea of Skiing into and out of a countered stance. It often gets offered as a common theme but to be honestly exactly where in a turn that occurs is open to debate. Leg steering throughout a turn would suggest to some that the least countered stance should occur at the apex but the largest leg length also occurs at that point. Since the inside leg flexing will drive the inside foot and ski forward, I wonder if that's actually possible. Another thought is that a neutral stance is when no lead should occur. That occurs early in a turn but again where that occurs isn't all that clear. Especially if we try to finish our turns with the most counter in our stance. It's where the smallest edge angles occur so the leg induced counter should be at it's minimum. At least until we consider slope induced leg length and the counter caused by that. IMO halfway through the first third of the new turn we would be passing through neutral and the body being laterally and rotationally squarest to the skis at that point would suggest this is where no lead would occur. That leaves the question of how soon after the shaping phase ends should we be migrating towards that rotational and laterally neutral phase. The outside hand moving with the ski through the turn and especially the last half of the turn is consistent with squaring up over time and after that strong shaping phase but to be clear here getting completely square still wouldn't occur until neutral and halfway into the first third of the next turn.