Backwash Causes Lift?

Tony writes:

For a theory to be accepted it has to predict observations. Trailing
edge downwash and some other things written here don't seem to do
that.

Actually, downwash can be directly observed in appropriate atmospheric
conditions. There are pictures on the Web that illustrate this.

Remember, in order to accelerate something upward, something else must be
accelerated downward.

When you hold your hand out the window of a car at an angle, and you feel it
being raised, where does the energy to raise your hand come from?