Interesting that Caballero both hints at how hard that is ("oh, this took me 20 years!"), but also somehow makes it seem easier as well - he was playing the Dvorak at 17 after all!
The Yamashita videos, grainy as they are, seem to show a completely different angle and position for the right hand to what Caballero has figured out.
(interestingly, in the Yamashita, his notation for the mandolin/dedillo appears to start with a downstroke ie one-string rasgueado, but it seems more likely if you're playing with the thumb too that you'd pluck on the beat. Never mind, it's still way beyond my hands though!)