I didn't look at the file , if he used custom shader patch to hide the nuts on right and replace them with his own, that's of course not modifying the content
and wasteful I meant from a point of view to have 2 sets ( normal + blur) somewhat big rim textures if the only difference is a small nut,
that's why if that was needed different solution makes more sense, by either having both nuts on the texture - which there isn't too much room left but could be done, or as Gary says have them grayscale on the texture and use detail texture for the color
since I need to update Kn5 file at some point with the fix I made, I might give the nuts a second look