The issue is that the man in the room isn't the mind, he's an appendage. He doesn't know what's going on because his mind isn't the "mind," the program generating the instructions is the mind, and if it's sufficiently powerful, it may possibly be considered intelligent. It's like how your hand doesn't understand English, it just follows the instructions sent to it by your brain that does. I'm not saying current "AI" is intelligent - it definitely isn't, but I think that a sufficiently powerful computer program could be. We're just a long way off from that.