You might be thinking "mega-loop" when I say "kite-loop"...
Terminology I use and therefore, so should everyone else
down-loop - looping the kite with by pulling your "forward" hand eg. steady tack, kite at 11, going to the left, pull your left hand - kite loops down towards 9 and then back around into the power zone. aka front-loop.
kite-loop - looping the kite by pulling your "back" hand eg. steady tack kite at 10, going to the left, pull your right hand - kite loop up towards 12 then around into the power zone. aka back-loop
mega-loop - tight kite-loop at altitude that pulls the rider horizontally, allowing him/her/ the mental-patient to free-fall with slack lines while the kite climbs to the zenith, only to catch the rider before they smash into a knee-destroying landing...
helicopter-loop - a loop in either direction across the zenith that provides more lift than pull.
You'll notice in the videos that they have their hand near the center and aren't fish-poling the bar, so the bar makes it look like the kite isn't really looping, but if you watch the lines, sometimes you can catch it making the circle...
What I think the key to the trick is, is a steady, slow transition of the kite from say 10 back across the zenith which makes the lift for you to do the trick as you pendulum around under it, then actually looping the kite hard as the lift dies... which is kind of how I do light wind water starts

I say "think" cos I've yet to try any serious kite-loop tricks so mad props to you for attempting it

Another good vid on using a loop as lift... dark slide again. Despite the Russian language problem, you can clearly see him building up to the trick by looping the kite and just riding it out. Just - make sure you have plenty of space downwind :o