This month's issue of Harper's covers this story. The writer basically laughs at the whole project since the thing had been closed and unused for years and this formal 'closing' was more a PR opportunity than anything. It's hard to blast the crap out of countries for their phantom WMDs when you yourself still have the machinery to make them.
To their credit, the destruction of the building also included the dismantling of equipment so that it could never be used again. But the errand was largely photo-op.