Since when are core names like GP104 "pretty PR names"? And since when do they have to do anything with die size?
As far as I know they've always been related to product tier segmentation.
Nvidia has used all sorts of internal chip naming schemes over time - NV20, G71, GT200, GP102. Yes there’s usually a sensible pattern but ultimately they can mean whatever nvidia wants them to mean.
There’s no direct correlation between a chip name and consumer price. That’s determined by performance, features and the competition (or lack of it).