I don't quite understand, what was sold here exactly? You can't sell the DNS since ".com" doesn't exist on the blockchain (you could for a NameCoin domain, but who uses that). So is it like a capture of the source code? Or is it really just a token saying "istheshipstillstuck.com"?
I can sort of get NFTs when it's about selling digital artwork since it's a way for the artist to generate artificial scarcity for something that's technically endlessly copiable and it creates a notion of what's "the original". After all, IP laws and regulations are full of that stuff (cue the "what colour are your bits" essay).
But here there's already a digital token that's unique and can be auctioned: the domain name itself. It's pretty obvious to me that the "true" istheshipstillstuck.com will be whoever owns the DNS, not some random person with an NFT token.