> that the argument of them being just a probabilistic word matching engine can also be applied to our own brains

But that of course is only as it relates to language. Which isn't at all the primary function of the brain and driver of it's experience. It's the other way around because it's all of the other stuff that drives language. Considering the human brain a probabilistic word matching engine fails to capture the underlying forces that direct the language output because a human can say completely different things about the same scenario based on a huge number of non-language inputs or factors. Language is just what humans have come up with to communicate all of the other things.