Weak AI is not criticized by the Chinese Room Argument. The argument proceeds by the following thought experiment. The program enables the person in the room to pass the Turing Test for understanding Chinese but he does not understand a word of Chinese. The larger structure of the argument can be stated as a derivation from three premises. Implemented programs are by definition purely formal or syntactical.
Minds have mental or semantic contents.
Syntax is not by itself sufficient for, nor constitutive of, semantics. Implemented programs are not constitutive of minds. Strong AI is false. The answer is that he has only the formal syntax of the program and not the actual mental content or semantic content that is associated with the words of a language when a speaker understands that language. You can see this by contrasting the man in the Chinese Room with the same man answering questions put to him in his native English.