the forged documents were planted by the French to discredit what was otherwise a good piece of intel about Iraq and Niger.
what are you suggesting, the Plame's CIA group knew the document was going to show this, because they knew it was a plant?
The origin of the forged documents is still a mystery although the French are currently designated as the most likely authors. What piece of good Intel about Iraq and Niger are you talking about? As far as I know there is none.