I don't get what the debate is...
Lift with an airplane is generated entirely by moving air over the wings. If the plane is allowed to move forward relational to a fixed position and enough speed is generated, the plane will begin to fly.
The conveyor belt will have no effect on the experiment whatsoever as long as forward force is being generated by the engines. Now if the wheels themselves were responsible for the forward motion, then the conveyor belt comes into play.
There is no debate as far as I can tell. Just people misunderstanding how an air-plane works.
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