Do not bring literacy into this; because the sufficiently careful reading of the post surfaces multiple ridiculous (worse, witless) passages no person would write. How closely did you read it?

    There is a theory, popular among certain very old and very tired philosophers, that all memories take up a kind of furniture in the head. The good ones are armchairs. The painful ones are filing cabinets, usually full. And then there are the memories that are neither: the ones that arrive uninvited, settle in, and start terrorising the other occupants by kicking over the chairs.

Pratchett would not have mixed the metaphors of memories being furniture and also people who kick over furniture. An LLM would/did absolutely make this mistake, given that Pratchett quote as a prompt.

    The City Watch came later, the way reading the Watch books always comes a little later than reading the Rincewind ones, on the same shelf but a little further up.

Ah yes, that familiar old way the Watch books always occupy a shelf that is simultaneously the same and also higher up. And never mind that the Watch books are newer...