>>55383143I think it's true. If you look at concept art for Sun and Moon, even if it's not 100% accurate, the general geometry of the locations is. In this picture for example, even though the player can't walk behind the lots like this, the streets and buildings are laid out the same way that they are in game.
I don't think that ILCA would have spent time and money on concept art that would end up so far from the final product.