At this point in the book, he certainly hasn't reached that conclusion. He's merely given parameters under which taking the Intentional Stance is a good idea; when it's useful to treat something as having a mind, beliefs, desires, etc. This, he says, will be a useful stepping stone to figuring out what minds and beliefs and desires really are, and how to know where they exist in this world.
Another month has passed and here is a new rationality quotes thread. The usual rules are:
And one new rule: