Oh for sure. But I used to read adventures cover to cover, so I'd know everything that was supposed to happen. Once I stopped doing that, I also just sort of stopped paying attention to published adventures more generally.
DT sounds like the most straight forward adventure ever.
Yeah, it was initially Matt's sample dungeon for new DMs, but because of when that video released and the reach it had, the Delian Tomb is probably one of the most played modules of this D&D generation that isn't a WotC official one.