Deluded FB sellers don't want to hear it.
In another Marketplace ad there's a person in an unnamed New England state that has a "Peugeot PX-10" for sale. It isn't a PX-10, though, it's clearly a UO-8 - as evidenced by the Aztec lugs and the lower-rent build spec. I sent a quick message informing the seller of that fact and was told that 1) my opinion was interesting and that 2) I should send proof that the bike was not a PX-10. I did. The bike is still listed as a PX-10.