Read the guide again, deleting the mono behavior / monoscript file is the least likely method and usually crashes the game.
There's only been one game which that method worked.
The most useful method is to identify the material mosaic, dump the material, find the reference path ID for the shader, dump the shader, then edit all colmask values to 0.
If you aren't sure if there even is a shader, use UAS to browse the texture2D files, and see if the mosaic is drawn directly into the artwork. That cannot be removed with code.