At the time, when 7,000 bitcoins were stolen, compared with the theft of 7,000 BTC, the biggest controversy then was whether to roll back this matter, because it undermined the blockchain’s immutability and went against consensus!

From the memoirs, @cz_ was probably acting in a moment of desperation and didn’t make a detailed statement after doing careful research.
Although rolling back would be very difficult to reach miner consensus on and the chances of success were slim, luckily CZ didn’t try to use a rollback to solve the problem.