If these source is legit they obviously don't compressed files for the Bayonetta 1 as much as they did for PS360 version.
Perhaps to spare CPU power for the decompression but I think it is only because Wii U can handle even very big uncompressed textures much better than the old machines. So there was no need to use much texture compression.
Bayo2 got obviously more optimizing for Wii U than the first part.