quote this part of the article:
4K says it will bring real-world assets onto the blockchain by issuing users of the platform an NFT symbolizing ownership of a physical good. The company obtains the item from a seller, authenticates, insures and stores it. The NFT holder can then trade their NFT for the physical item.
It is not a true NFT but scamming users to trust in a third party that checks out physical items ton behalf of them and therefore they do not that physical item but prove that they have a NFT of original item in a third party, which does not mean you don't have it personally.
Think about it and you kept your box key safe in bank, you need to trust that the bank will give you that key and your box is safe and therefore more complexities.