I accidentally met a man who does this. The Chinese have learned to make a lot of branded items very cheap, but not all. They did not learn how to make branded glasses, but their dresses, T-shirts and bags are of very good quality. The certificate is also easy to forge. Store employees are engaged in such fraud, the owner will not do this.
When a customer detects that the GPU is counterfeit, can he get his money back?
Maybe you need the information to reach the owner to be able to make the claim.
There is a lot of such fraud with video cards on aliexpress, when instead of 8 GB the seller sends a 4 GB video card, or instead of a more expensive model, he sends a cheap one, but at the price of a cheap video card. The return is very long, and the seller hopes that the buyer will not be involved in the return procedure. But the price of such ads is always below market prices.