Actually the point is that the yields that you posted are very low and why give Saddam straight phosgene -- a known chemcial used as a chemical weapon? At least make him work for it.
But thanks for the post and the information. It was interesting information.
If it has low value as a munition, if other chemicals with the potential for weapons (such as hydrogen cyanide) are easier to produce, if it is a necessary component of the chemical and agricultural industries that existed in Iraq before the war, if it is easy to produce, and if it is a waste of your resources to trace the stuff through the economy because it is easier to detect and track munitions, then it is no big deal to let him buy the stuff and keep your focus where it belongs.