But the author, presumably non-american, was able to solve the challenge, so obviously it didn't prove him american. But it did prove him human because humans h

But the author, presumably non-american, was able to solve the challenge, so obviously it didn't prove him american. But it did prove him human because humans have that innate flexibility (if they choose to!) to recognize stuff and understand the intent even when it's not completely unambiguous or immediate. And that's the point.