I just thought of another angle, on a top of all the arguments given before. It is totally impossible for any kind of reflection to move across the whole frame, while camera's lens and it's object were completely static. For the Sun's reflection to move, camera lens needs to be rotating relative to the Sun. Here we obviously have static frame and camera's lens continuously pointing in a same direction. That completely rules out reflection idea. And this guy, as an 'expert', should know that. He's totally dishonest. Second thing is object goes up, than along the Concord's fuselage, than up again. Reflection can not do that, reflection would follow on a continuous straight or arched trajectory, without any sharp kinks.