The date of the story is 4 April 2003, 6 days before the 101st was there with their embedded reporter. The point is not the suspected nerve agent, it's that this was a contemporanious report at the time 380 pounds of HMX were allegedly being looted because the site.
To me it certainly looks like the site was being investigated. They found thousand of boxes of suspected nerve agent. Curiously however, they somehow missed 380 tons of HMX. That doesn't pass the smell test in my book.