It's an HD pack. I've been following this project for years now.
How can they get C&D by Capcom for an HD texture pack?
All the assets/textures have been taken from real-life locations in Spain that were used for the actual development of the game back in the original 2005 release. And others were taken from real objects.
This isn't a remake or a fangame, it's just an HD pack, a highly detailed and one with a surprising amount of effort and research that rarely any other HD pack does.