No proof for that, it's flat now and the winds aren't doing that.
Uh, airplanes work. Cause relative wind.
No, planes fly because of "lift" a low pressure area created on top of the wing by wing design and speed. I am an ex aircraft mechanic, you don't need any wind at all to fly.
I'm a pilot. Angle of attack is based on relative wind speed. The lift generating pressure that you're talking about is the direct result of a difference in relative wind speed from the top of the airfoil and the bottom. So is the course flown by the aircraft vs the direct heading.
Arguing that a commonly understood concept of "relative wind speed" isn't a thing seems retarded.
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