… and anyway, a wing ( or an inverted –wing) are not creating lift differently from the way a water-ski is creating the force to lift the water-skier ….. just push down sufficiently quickly a sufficiently weight of water ! ! !
Theory about higher/lower pressure under/above a wing is just a mathematical explanation of a physical phenomenom, which just states that it is necessary to change sufficiently rapidly the direction of a sufficiently heavy flow of air (or water) in order to impart a lift force to the wing/waterski or whatever other body .