Well, it's a little like explaining how wings fly by sticking your hand, palm down, out a car window at 60 and saying, "See? That's how." For decades, we all believed that airfoils created lift because the air flowing over the top had to go faster to rejoin at the trailing edge the air going under the bottom, until somebody said, "Why? What law requires one air molecule to exactly meet another?"
What this discussion has so far shown me is that we're all baffled by how ground effect works. We haven't progressed far beyond a military flight instructor a friend of mine had back in prop/piston days, who cautioned him to not add power harshly during a close-to-the-runway go-around, because he'd "blow the lift out from under the wings."