selfdestruct call was made, all the balance was transferred to the deployer of the contract. Why are withdraw requests still being processed?
Previous answer follows:
After a contract calls
selfdestruct, the code and storage associated with the contract are removed from the Ethereum's World State.
Transactions after that point will behave as if the address were an externally owned account, i.e. transaction will be accepted, no processing will be done, and the transaction status will be success.
Transactions will do nothing, but you still have to pay the transaction fee. You can even transfer ether. It will be locked forever or until someone finds one of the private keys associated with that address.