Faerie's aire and death waltz

https://www.youtube.com/watch?v=6NY1O9s02Ts

That player is a machine! Such an intense, relentless bass part, his hand is like this spidery alien, dancing

I'm not sure what piece they were playing but it doesn't match the piece of music here. So either they aren't playing the Death Waltz, which was a joke and not meant to be be played, or the picture is really wrong. Apparently it's really common to mistake the Death Waltz with other physically impossible to play pieces.
youtube . com/watch?v=KRRx8kYZAIY