I'm not even going to pretend I know what the f*** this mod is about. From what I understand, this crab joke is a response to a meta joke within the Dark Souls 3 community. Because that is SO hilarious, someone went and replaced all the textures in the game with crabs. I would talk about what a waste of time and resources this is, but really I'm sure it didn't take all that long to accomplish.
It's dumb but it gave me a few chuckles. That also may be due to the fact that I'm extremely tired and writing early before the SDCC storm. Thanks VG247 for the tip.
If you really want the mod...click here.