there's something's highly suspect about someone not understanding the difference between art made by a human being and some output spit out by a dumb pixel mixer. huge red flag imo.
Translation. I can't argue your point so I'm going to try characters assassination.
if the original Mona Lisa were to be sold for millions of dollars, and then someone reveals that it was not the original Mona Lisa but a replica made last week by some dude... do you think the buyer would just go "eh it looks close enough"? no they would sue the fuck out of the seller and guess what, the painting would not be worth millions anymore. it's the same painting. the value is changed. ART IS NOT A PRODUCT.
Pretty ironic to say art is not a product and then argue that its monetary value would decrease, which can happen only if you treat art as a product.
Imagine if instead of a physical painting Mona Lisa was a digital file and free on the internet, would people think Mona Lisa is less impressive as an art piece because anyone could own it? I think it's artistic value wouldn't decrease, only its value as a product would decrease because everyone could get it for free.