The key elements, ancient astronauts and the Stargate’s coordinates, were in the movie and were fully exploited in a way that was consistent with the events in Stargate.
If only I had known that slapping together a pile of randomly-fresh corpses would come out looking exactly like Aaron Eckhart I probably would have taken up grave-digging long ago.
It's genuinely pretty creepy, and also explains a lot of things from the film and makes it a smarter movie overall, despite the weaknesses in its core concept.