Even though he is against torture, he doesn't want the CIA limited to the Army manual. That's because the US Army is not in the business of interrogation. That's the CIA's job. If you limit the CIA to the Army's rules, you are eliminating the CIA's ability to do it's job. Unless, of course, you consider getting a name, rank and serial number to be a successful interrogation session.
The army has many interrogators, probably more than the CIA and until the Addington and Yoo came along and decided to muddy the waters about what was acceptable behaviour by Americans, Army, FBI and CIA interrogations were well within acceptable human rights standards and the geneva conventions.