He has a couple of nifty plugins to the LLM utility [1] so I would guess its something as simple as ```llm -t fabric:some_prompt_template -f hn:1234567890``` and that applies a template (in this case from a fabric library) and then appends a 'fragment' block from HN plugin which gets the comments, strips everything but the author and text, adds an index number (1.2.3.x), and inserts it into the prompt (+ SQLite).

[1] https://llm.datasette.io/en/stable/plugins/directory.html#fr...