Loto does it, how common is it?
Is that not just body dragging?
I take my hat off to anyone that can crank any upwind angle barefoot kiting.
I used to barefoot water ski as a teenager, many moons ago. Behind a kite? I reckon you would need to go out on a 12m in a cyclone.
I think Orange Whippet might have put some of those mushrooms on his pizza again that he finds growing in his yard after all the rain.
But if you are interested in trying to barefoot kite, maybe put up your biggest kite and wear a pair of diving flippers on your feet to get a bit more surface area till your up and moving, then kick them off. Please post a video of your attempt.