And the article itself states that Iraq's chemical weapons were indigenously manufactured. And the foreign involvment in the Iraqi chemical industry was basically German/French/Russian. (and much of that "dual use" technology anyway.)
So actually NOBODY "gave" them WMD to use against Iran, much less the US.
You're asserting that Rumsfeld would visit and bring a briefcase full of mustard gas?
One simply cannot reason with such unreasonableness, just as one can't convince the unconvincable.