I can't really thank one specific user here, but the two persons I know noticed the video was Shrev64 and Hallowseve15. It is confirmed. You can actually revisit Empire City in inFamous 2. This is the closing thread of all other threads seen here, about "I visited Empire City!" or "can you visit Empire City?". The truth is revealed, and here we stand, at the End of The Road of the mystery. Want the video?
Too bad!! Here you go: The Tutorial Video and a crappy video of Cole in Empire City inFamous 2