1. Is when something is so bad, or so poorly done that a simple modification will not correct it, and the project needs to be redesigned altogether or scrapped.
2. Something is modified so much, it is designed anew, or seems to be a totally different design for the same purpose. The play plywood retainer wall was demodified into a concrete bag alleged retainer wall which need to be de-modified again.
Estancia Palm Springs said their poorly consturcted Retainer Wall was "Structurally Insufficient". Whereas, they claim the wall need modification, I beleive it really needs de-modification, because it is so bad that no quick fix will do.
A modern automobile is a demodification of the horse drawn carriage.