"Hmm... I can't say that I've ever been there so I wouldn't know from this angle at least with no landmarks, but I think a lot of large cities in the world tend to look similar if you don't know where to look."

Well, she wasn't wrong? Technically it was the only one (as far as he was aware) so it was THE New York City.

"Is it? Many people you know from your world live in New York City then?"

Trying to be subtle and not outright saying what she said was incorrect.