That belief is incorrect, but extremely common, so it's dubious to describe it as weird. Indeed, the fact that so many people hold that belief is at the root of the whole NFT situation.
As far as I know, the inventors of NFTs do not claim that they do. But it seems like a lot of people talking about and perhaps buying NFTs don't understand that.
How much of art's value stems from that enjoyment? You're right, probably a negligible amount. For investors, the only important property of physical art is that it's extremely hard to forge.
Somehow I think it will transfer money from believers to a small group of non-believers.
So it's like a certificate of proof that you donated money to an artist that you can then trade and sell and possibly make a profit from.
If I'm understanding this correctly.