To quote an inspector (retired) with whome I just shared thei pic:
"I can't believe anyone would be that dumb!"
No, it's the new inverted thinking method. Exchange insulating materials and conducting materials. Though to do that properly (?) you'd need copper pipe with nylon rope inside to ground that plastic pipe...
Related to that other thread in that other forum on this web site about management skills, maybe some boss told someone to ground the water pipe. "But it's... " "Shut up and do it!" "Okay"....