He was stating emphatically that his stmt wasn't what lead Shrub to invade Iraq, as he felt the administration had been implying. His explanation that the discussion where he made the stmt was not about whether Saddam had the WMDs, but was about the case against Saddam clearly puts him in the middle of selling the war to the American people.

If he knew as much as he did about the actually intelligence and had the concerns he said he did, then he shouldn't have been as involved in selling the war. He did what was expected of him, rather enthusiastically.