I don’t understand how a NFC tag linked with a NFT of the product ensures authenticity of the product. Let’s say it’s for a designer bag. If that bag wears dow

I don’t understand how a NFC tag linked with a NFT of the product ensures authenticity of the product. Let’s say it’s for a designer bag. If that bag wears down, and I move the tag to a bag that looks the same but wasn’t sold by the manufacturer, how do the tag or the NFT help discover that the bag isn’t authentic?