So not sure if that's the issue, but it seems the files are in the wrong dds format.
I can't open the files in the preview, but if I re-encode them as .dds DXT5 (the format eso uses), I can preview them. So the files are probably not using DXT5.
Also note the filesize difference.
(original file on the left, re-encoded file on the right)
Not sure, if that's going to solve the problem, but you could try replacing the textures with these DXT5 encoded ones:
https://www.dropbox.com/s/vn26kmezfg...leted.dds?dl=0
https://www.dropbox.com/s/4vxgif6hcr...leted.dds?dl=0
Note that the game needs to be close, when you replace the textures because the game it caches the files.