Hm, as far as I can tell, there's nothing to indicate it isn't what they claim. There's no Orb Union here, but plenty of other places and locations match up exactly.

[Cagalli makes sure to keep pace with him, only walking a step or two ahead to properly lead the way but still close enough to easily converse.]

The others have been here longer, but they would've mentioned if they had doubts on that front.