Both parts sound about right

“Then he looked at me and said, ‘How was I supposed to know that cowboy George Bush would announce he wanted us ‘dead or alive’ and then invade Afghanistan to hunt us down?’” Mitchell writes. “KSM explained that if the United States had treated 9/11 like a law enforcement matter, he would have had time to launch a second wave of attacks.” He was not able to do so because al-Qaeda was stunned “by the ferocity and swiftness of George W. Bush’s response.”

And the followup

But KSM said something else that was prophetic. In the end, he told Mitchell, “We will win because Americans don’t realize ... we do not need to defeat you militarily; we only need to fight long enough for you to defeat yourself by quitting.”