Not even close to a sane take. If you look at the text exchange is clear it was done without the owner knowing. As an owner the renter could have cut all sorts of corners… you’d have to tear it all up just to even make sure its water sealed properly just so that your house doesn’t rot the through because some rando renter made choices about your property. If your going to drop 12k on a reno of a bathroom… drop it on a down payment instead.