It’s an adventure, it’s not history, it’s not something that happened in a particular place at a particular time. It’s something that happened thousands of times in thousands of different ways.
And of course it has to have changes, since it was written before concepts like “making sense” were part of D&D. But I expect the core idea will remain the same: a small band of mercenaries arrive at a remote fort looking for work; nearby are caves inhabited by humanoids who are hostile to the people in the fort.