Not to sound like a broken record here, since I have said the same thing in many posts elsewhere on the forum, but the secret to this technique is all to do with the motionless wrist and palm mechanism that enables the finger to operate from the knuckle downward to the fingertip. He is enabling his physique to use the least amount of energy possible to access the notes by remaining completely supple in the arm and wrist. Argerich plays exactly the same way.
He does collapse his palm support at times, which makes the finger activation a bit more difficult. But with this piece, especially the first 40 bars or so, it is the awkwardness of the key and the double notes that causes this to happen. As you can see, he is able to control his musculature well enough to disallow any tension from creeping in. Once things start to tighten, this piece is nearly impossible to play. Can this technique be acquired? Of course it can. It all depends upon how conscious you are of the independence of movement of the finger separated from the wrist and palm.
Oh, and yes I have played this piece.