Probably it was a video of the mod, there is some out there on youtube, so you may be confusing things.
Easiest way to know if its the game is to look at the landscape: Polished-like, beautiful but heavy-consuming, its the mod. Simpler, uglier is the game.
Just check the official vids and a mod one and you will see it.
BTW, looking for this mod. It looks great.