If your wallet was stolen, deleting it will not do anything-as it just removes it from the Metamask UI, not from the blockchain. You most likely imported that account with your private key. Metamask does NOT store or associate private key imported accounts with your seed phrase. If you are missing the private key to that account, then it's unfortunately... ...
account = w3.eth.account.create()
I can't immediately see that this method exists in Web3.py (I can't see it in the docs). In Web3.js it returns the following: