He isn't improving 1.0 - he is replacing all the models of 1.0 with the show-based models in Game of Thrones: Enhanced. So it will be the same mod with completely different models.
Sure - it could be seen as an improvement. But 1.0 is based on the books and this mod probably aims to be more like the TV-show. It is using the 1.0 mod as a base for building a different mod i think.