The contours of the blanked out area do not match the silhouette of the shuttle. If anything, and this theory were correct, it would be a part of the structure int he back of the model holding it up. But if I were making a model with open area behind it for replicating outerspace at near earth orbit, I wouldn’t have dark structure in the shot. So it’s probalby not even that. But it’s definitely not shadow.
Trace the light source above the model of the shuttle and it lands right on the big head guy’s cheek.
Research these other NASA reflections. It’s fake jake. Here’s one to start it off.
https://www.youtube.com/watch?v=l3I4pVSSw-8