It was only a step Turing happened to take while solving Enigma, on his long journey to find back Christopher, as the title suggested, the imitation game, in which he tried to replace Christopher with a machine whose way of thinking though different couldn't be judged as not thinking.
In this sense, Joan just never got it. She had a great talk in the end but never got what Turing meant. Her speech was a product of logic, from the respective of cause and effect, Turing's achivements along with their attributions. But it was interesting how Turing responded with one question - Do you really think that? (Quite a typical act Turing would have as a guy troubled in interpersonal communication.)
It is not fair to say Joan was wrong because she plainly didn't know the story about real Christopher, like we did, but we could say that this machine shouldn't be simply called Turing machine, nor the computer. - It was Christopher.
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