no no, thats actually right. the plane will move faster. thats the only way it can travel down this long not-a-treadmill.

lets say our plane takes flight, on a runway, at 150 MPH. on runway, ground speed (respective to the runway) = air speed.

On the treadmill, if the plane takes off, its air speed = 150. However, the ground speed is 300 (relative to the tread belt).

You have the plane AND the treadmill both spinning the wheels. Their point is, wheel speed has no effect on the rate of travel.