I only missed 1 in 8, and I attribute that to a bit too much wine on a Saturday night. I heard "farm fresh" as "farm fish" and thought I was a genius for catching an algorithm error...
However, as I mentioned in this comment[1] I don't think you have much to worry about. The correct criteria for diagnosing fake vs real is actually not being robotic. I knew immediately what was real because there was emphasis and affectation, as opposed to the monotone counterpart.
Finally, a minor quib: "psychopathy" is not about an ability to infer intonation (quite the opposite). I'm an introvert like you (Hell, I'm probably considered a hermit) and I was easily able to identify the doppelganger.