There is no way the computer-generated answers were produced by a mere "language model." One of the fake answers referred to a specific book written by Dennett

There is no way the computer-generated answers were produced by a mere "language model." One of the fake answers referred to a specific book written by Dennett which was on the topic of that question. So, in addition to a "language model" there are specific facts about Dennett and his work that the system must have had access to. I can simulate Dennett myself by rephrasing passages from his books. It seems that's what this algorithm was really doing. For complex subjects like this, the inherent stupidity of the AI is easy to cover up in the space of just a couple of paragraphs, yet must be evident in longer pieces, because the system doesn't connect concepts in a persistent way.