Genius move! The shop know their customer segments. And quite a customer statement to go for the perfectly scored 84 pointer. Most alcohol intake for the money and no horrible long finish to be reminded of how bad the wine drinks after chugging rather than sipping the wine.
There are two issues here:
What made it attractive to the store’s buyer?
Why put up the shelf talker, if it had been read?
If the wine is as reported, perhaps they are trying to remedy the purchasing error with anything at hand, plus they will not have to talk about it and tarnish their personal reputation verbally with their clients to make it disappear.