Great skiing! I'm pretty sure I know who this skier is, even though I must admit that it doesn't look like the style (i.e. line) that I'd normally expect to see him skiing. One give-away to the identity of the skier is his very strong leg-steering skills, as Rusty points out. He cleanly directs both skis precisely where he wants them to go. Note that, despite powerful rotary movements of the feet and legs, the skis still travel almost always the direction they're pointed. There is very little intentional braking or lateral displacement of the skis (skidding), especially when the edges are engaged.
These bumps are not huge, nor are they terribly steep for a skier of this caliber. I believe we'd see different tactics on a more demanding run. But what we see here is a very nice line, minimizing the need for great absorption (flexion-extension), although, as Miles notes, the capability to absorb more when needed is evident too. Good tactics! Very accurate fore-aft movements as well, as evidenced by the skis nicely following the contour of the snow. Only occasionally does the skier get "bucked," and he is able to recover quickly. That's good bump skiing!
Another good image here is the skier's highly disciplined, yet very relaxed and free, hand and arm movements. It's a great illustration of the "polarity" (as Weems might say) of freedom and discipline. Both are essential. Discipline without freedom is restrictive and stifling. Freedom without discipline is chaos!
The freedom of movement allows this skier to balance, react, and move his upper body as needed to deal with the demands of the changing terrain. The discipline allows him to make these upper body movements without interfering with the precision of his foot and leg movements.
If I were to nit-pick about anything--and nit-picking it would be--I would suggest that there are a couple moments when a little quicker, more active extension into the troughs might have reduced the jarring and allowed a little more pressure control on the downside of the bump. And if I were this skier, I would experiment with slightly shorter poles.
It's great to watch skiing this good on the first day of summer.