Interesting, did they say how they know? It's not surprising really, a lot of ideas wind up morphing before they're completed.
IMHO, (and it's just opinion, not trying to ruffle any feathers, and didn't read through the whole thread, so don't know if I'm going against the grain here...) GOtG fits better in Epcot (what-used-to-be) Future World than Moana does. The sci-fi theme is at least close. I could have seen Moana at AK maybe. I loved the movie, but I don't really get how it fits in Epcot. I'm certain it will be beautifully done, as most things Disney does, but not terribly excited about the seemingly random changes to my favorite park.
Also, fwiw, just about everyone I know has ridden GotG and really liked it. (I'm not really a roller coaster lover, so I haven't ridden, but I might be convinced because I like the movies, and I'm told the music is good in the ride, lol).