How is that money laundering? You'd have to buy ethereum with cash, but at that point why bother with the NFT? Just sell the Ethereum on coinbase and you've laundered the money.
Edit: besides that, the point of 'laundering' money is basically to get it into a form where it is officially yours, in the light, with taxes paid. The NFT is a conceivably 'legitimate' transfer of value. I made a thing and sold it for money, and declared and paid tax on the capital gain - boom, legitimate.