Humans can do something, doesn't mean humans only do that thing and nothing else.
Humans have many models of the world running in different modes in parallel, enabling us to make sense of things other than just process language and come up with plausible sounding answers within the rules of a given language.
Our understanding of concepts is different than how we process language, demonstrated in that there are perfectly intelligent people who can't communicate using spoken or written language (including sign language) but can do so using other methods which demonstrate language processing isn't essential to our intelligence.
The way we learn information and integrate it into our neural network is vastly different than how we train our artificial models using machine learning. Even if we just take language processing, we definitely don't learn by reading the entirety of written human language many times over regardless of what language it's written in, until we can understand how it's underlying mechanics work so that we can form plausible structures of word-chunk strings without necessarily understanding the concepts behind the word-chunks.