It's pretty bad... This person's obviously talented, but their playing is riddled with mistakes and timing issues. That's not an issue with their playing, it's the constraints of the medium. For example, `[etuG]` is a chord from the video that's impossible to play as it requires a modifier key for 1 of the 4 notes. Plus, the use of modifier keys and the number row for low notes means that the experience no longer maps nicely to a piano. It's effectively learning a bespoke instrument.

This isn't necessarily a problem. As you say, constraints can breed creativity. A good musician should still be able to play great music, but for somebody just learning it's a lot of unnecessary friction.

I'm amazed by this.

At the same time, if this is the best one can hope for on a computer keyboard, I feel comfortable resting my case.

A little undermined by the fat finger within the first 10 seconds.

I think it's an intentional ornament.