Well the secret of that particular keyboard is (beyond that a very good player is using it) the keyboard itself, a ROLI Seabord grand. It has rolling keys that are not like a traditional MIDI keyboard, and that's the point of the Anderson advertisement (yes it is an advertisement promoting the ROLI that they sell and showing how different it is from other keyboards). So more of an ad than a musical demo.
https://roli.com/products/seaboard-grand
It's also a very expensive keyboard, as you'll see when you click the link. The 88 note version is $8,888.