He's faking it, and everyone is lying to us. They are all lying. The commenters on youtube are lying. He is faking it and this piece is the height of all piano techniques. If you cannot gorilla rape the octaves in this piece, you are not really a pianist. And the audience is being lied to, and you are the one doing the lying. They teach you in conservatory how to fake it, how to trick the audience in order to spite them, and to be sycophantic towards the critics so they will lie for you. Everyone is lying and he is not really playing, it is just a record of Kastle playing while Lang Lang air-taps the keys.
Walter Ramsey