From your source:

> "These weapons were not part of an active arsenal. They were remnants from Iraq’s arms program in the 1980s during the Iran-Iraq war."

These are not the "WMD" that led to or had any involvement with 2003, it's dishonest to suggest so

These were chemical weapons found in Iraq, the reason the new york times was interested in the story was the fact that ISIS has somehow developed chemical weapons using Iraq's existing infrastructure.

This means there were active facilities, materials and know how even after the war