They were making the point that using a word processor as a tool isn't the same as having an LLM write something, then retain the LLM generated changes such tha

They were making the point that using a word processor as a tool isn't the same as having an LLM write something, then retain the LLM generated changes such that it is immediately obvious the bulk of the code was generated by an LLM, not that it isn't possible to discern whether someone is using a word processor.