Computers and humans run programs differently
A man instantiating a chess program without knowing what he's doing is not playing chess: a computer doing the same thing is playing chess. It seems reasonable to suppose that the situation is similar in the case of speaking Chinese.
Thus, a man running thorugh the steps of a program without knowing what he's doing is not speaking Chinese: whereas a computer doing the same thing is speaking Chinese.
Richard Sharvy, 1983.