Somebody is always trying to find an angle.

Digital swampland for sale.
Exchange value stands in for value but is not value itself. Exchange value is only an expression of value. Exchange value is coupled to use value, another expression of value.
NFTs clearly have negligible USE VALUE. While both USE VALUE and EXCHANGE VALUE are expressions of VALUE, they can't stand in for each other. But they are related. They are both expressions of VALUE.
What happens when anything is multiplied by zero?
Yeah. That's right.
Price discovery (exchange value) also naturally yields zero.
I think so. Marx covers price discovery in Capital Volume 2? Volume 1 (in the mail to me) describes the capitalist mode of production. Value is explained but a market for the products of capitalism (commodities) is assumed in Volume 1 as conversion of commodities to money is external to the loop of production. I won't know for sure until I read it.