Kid is very talented and probably plays at a level that most of the 70+ yr olds here will never reach. But here's the thing; I'll bet my first born that he didn't start lessons on an arranger keyboard, he started on PIANO. Without formal training, most people will not be able to develop the technical skills necessary to perform what you just heard, especially at that age. If your kid or grandkid is interested in music, make sure he learns the 'basics' first. JMO.

chas