The best word I can think of to describe this question is 'disingenuous'. The name of the airport is Tunis–Carthage International. Obviously the setter couldn't give this name, so he or she has decided to make up a name that better suits his or her purposes.
It's an academic point really, as all you need to know is what modern country the ruins of Carthage are in. I'm guessing that the number of Quiz League contestants who know where there's an airport that's named after Carthage, but don't know what modern country the ruins of Carthage are in, is quite small.
So why not just ask what modern country the ruins of Carthage are in?
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