[bnralt]

I'd say the biggest slight of hand is that human's understand other humans "knowing" something as something happening internal to an individuals brain. Holding a biology book in front of you doesn't mean you know everything in the book. What you "know" are the things from the book that you've stored in your brain.

We can modify the thought experiment so that it's something internal to the persons brain. The person doesn't learn Chinese as most people do, but a computer rewires their mind to be the same as someone who did. Think of The Matrix, when Neo says "I know Kung Fu." Would people then say this person speaks Chinese? I imagine just about everyone would say yes.