I disagree that it's not creative. It's not like he took those original bits and used them whole cloth one on top of the other. He edited them, remixed how they were put together, stuttered them or restarted them or looped them in order to fit his vision of a new composition.
It's like saying that Bach, Beethoven, etc weren't creative because they didn't actually play their own music. The main difference is here he's taking what's been played already and making it into a new composition instead of making a new composition in a vacuum. Which may arguably be even harder, since you're limited by your source material.