Infants demonstrate reasoning capabilities before they learn language skills. Human reasoning is not derivative of language generation, and it's certainly not derivative of text generation (illiterate humans are still capable of reasoning). Humans demonstrate reasoning even in the absence of language skills.

LLMs approach learning differently -- whatever reasoning they do possess is an emergent property that arises as they get better and better at language generation. In other words, unlike humans, LLMs learn to "speak" before they exhibit behaviors that look like logical reasoning. Humans do the opposite.