I think you gy's may be reading it wrong. I read it as 2 separate quotes. The first part is saying that Erich von Daniken came up with an original idea. The second part is Scott saying he has to do something similar.
There's no link there, he's just using Daniken's theory as an example. That's how I read it.
Either way the movie won't be shot "millions of years ago" unless it's in a galaxy "far, far away" which would mean nothing to do with the Alien franchise.
Sure you could say the SJ is a million years old, but then your just creating a back story for your back story?