I think it's a typical case of "finger"synching. He's smiling for the camera, and probably recorded it. himself, so he could do the camera face thing. It's great playing, but I'll bet it was prerecorded. What we're watching is not a musical performance, it's a marketing performance.
Not that there's anything WRONG with that ...
I agree!!
Sit back enjoy the performance, and learn something from the demo.
If someone watches the performance tryng to find something to complain about...they will find it.
Regards,
Jerryghr