Isn't that ultimately how anything works? I can print out a cheap copy of the Mona Lisa, say "I'm selling the Mona Lisa," and someone can purchase it if they choose to. Of course, I may have broken some laws in the particular government jurisdiction this transaction occurs in, like trademark, copyright, fraud, etc., but that's just as true with NFTs.
This just doesn't seem like a valid criticism of NFTs. There are plenty of valid and strong criticisms of NFTs available, so there's no need to invent invalid and weak ones!