Nothing is deleted from the blockchain– it can be transferred to a place that is not controlled by anyone
To 'delete' a token on Ethereum or remove anything from circulation, you must follow a specific process.
This is often referred to as burning. You will transfer the token to what is known as the GenesisAddress. (Black Hole)
0x0000000000000000000000000000000000000000
Transferring a token to this address effectively deletes it from the blockchain by rendering it useless. The Genesis address is uncontrolled. Users send their unwanted items to this address, and new tokens are often 'minted' or 'birthed' from this address.