Deleting items from blockchain-based storage systems works a little differently than deleting items from traditional systems.  Don’t forget, one of the benefits of blockchains is that once something is written to chain, it is there forever and can’t be changed. 

With blockchain, deleting an asset is called “burning” it.  When you burn a web3 asset like an NFT, what you are really doing is removing the pointer to that asset from whatever system you are using.  The asset still exists (on IPFS storage, for example), but there would be no way to see it.  Ownership is generally transferred to a “burn address” on the blockchain that nobody owns or controls.