It look like those are double strings. Meaning they are like the 12 string where they are tuned the same as the other strings. The second video shows a close-up of his fretboard. They are too close together to be played seperately. That is my guess.
So I know that this is supposedly doubles on strings 1, 2 and 4, and on a 12 string that would be strings 1 and 2 in unison and string 4 an octave up. I just don't have the ear to tell if that's how they're tuned.