Wonder if the fact that the actual author is asking the question taints the result in some way; same for all the examples in this thread using unpublished articles. By definition only you would have them, so if there are system level prompts somewhere with your name on them...
Yeah, they said they used the API, but it sounds like they only did that for one of the examples?
The other examples were to eliminate some other ideas (guess based on topic etc). If be interested if all of those were done via the API since some level of information linking from the account is my best guess for how it got all of them.