~ is there a possibility to cancel the tokens he stole without having to migrate to a new contract? He used the tokens to drain our pool on the dex we're using, so it stands to reason that any liquidity we use to repopulate the pool will be drained in a similar manner.
There is none.
How could you expect such things is possible? especially since the attack vectors are unknown and even if it is known, the fund that have been lost has nearly zero chance to get it back. Have you heard if there is any vulnerability of another project that results in the funds can be retrieved back? I don't think so. Why exactly would you think that possible anyway.