"They are phrased in the way that Terry Pratchet would have."

Right. That's one of the suspicious things here. They're phrased in the way that an LLM might write if you told it to imitate Pratchett.

Edit: that's effectively what happened: https://news.ycombinator.com/item?id=48247127#48248070

> I wanted the sentences to feel a bit more Terry Pratchetty and thought a lot of Claude's suggestions were really better than what I had made.