I think. im 99% sure. Some people think it is, some people think the demo level was made for the level. But if you go onto the otherside (the side you could get to if the tie fighter doesn't crash and destroy the bridge) you find a door that has locks on it, and the map shows that theres a room behind it. here's a picture
if you want to random explore that side and force grip the shooting tie fighters so they hover in the air while firing, build 2 towers(one short one for reaching the tall one), and hop on one of the assembly lines above you, then simply walk along to the other side and jump down
and out of curiosity, as it has nothing to do with this thread, does anyone else but me push doors shut after opening them?