Ashmed's Laundering of Cryptocurrencies

The feds alleged that Ashmed then proceeded to launder the stolen crypto, which is a pretty standard technique. What's unclear to me is how he was able to get a normal account to imitate that admin style account. He allegedly figures out this vulnerability in the smart contract, uses this flash loan vulnerability to pump a bunch of money out,. take out these inflated fees, return the loan and walk away with $9 million in crypto currency.