That is very different from kite jumping.
In kite jumping you move your kite in the sky and obtain instantaneous pull, so you jump.
You are in front of your kite.
In dune flying, you use the ascending winds on the dune to create the
lift. That's now currently practised by paragliders.
Anyway, flying with small kites appears as too dangerous to make a sport
Here Bruno has the harness point in his back.
It was easier to run in the wind but rather...ugly when flying.