I agree that pangram is not infallible. It has a reported FP rate of like 1/10,000, which is decidedly not zero! Having used AI to write fiction before, and working with LLMs all day, I do feel pretty confident in my ability to detect them. Pangram is just a way to make sure I am not totally ungrounded. Moreover, I don't actually particularly care if someone uses an LLM in the process of writing their work. What I care about is how it sounds. This story reads like an LLM wrote it, optimizing towards what a novice writer would find appealing.