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Any forward momentum from the thrust, is negated by an equal and opposite momentum of the conveyor. We need momentum to move the plane through linear space so that air can move over the wing. It aint going anywhere. And if it was calibrated exactly, you would hardly see the conveyor move.

But the wheels aren't driven! They're just big casters basically. The force of the conveyor only spins the wheels. The thrust of the plane acts on the air and propels the plane forward. The conveyor has no impact on the relationship between the air and engines.

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