Excellent!! Your video is excellent in understanding how it is done
That's the challenge with Kimo, at first it looks trivial, then one tries and it looks impossible, after a while it looks feasible and then you realize how much effort has gone into making it sound smooth and good. There is a lot physical conditioning and effort behind his playing. The chords + melody is not overly complex but many years of understanding a uke and it's sound and being able to control it, together leads to his sound.
Which Uke are you using?