Diabolo.ca VotW: 11 may 2006, TempeiTempeis video is very clear. Learning to "step away" from the stick is the mainpart of the trick really (not that difficult). Doing it smoother like in the second clip is a bit more difficult.
In that video its not infinite. You can do it infinite when you put the diabolo on right backside and start doing infinite suicide with your left hand.
I might be wrong, but I'm almost positive that tempei's is infinite. He right front wraps, but the effect is the same. Edit: Also, yet again, not sure, but it makes sense to me that you would want the diabolo to be nearly perfectly vertical to perform this trick smoothly, because of the rapid rotation. Correct me if I'm wrong on either bit because I am very curious about this trick in particular.