From the link above that I find noteworthy;

Al-Sahhaf described the threats as a "kind of martyrdom operations" and insisted Iraq will not use weapons of mass destruction. But he added that the airport, which he described as an "isolated island," will be a "graveyard" for Americans

On the other hand Al-Sahhaf lies as this same article points out;

Al-Sahhaf's proclamations have been notorious since the war started. He has told the media that the Iraqis have been slaughtering coalition forces and has insisted that Saddam's regime is in full control of Iraq, despite all the reports coming directly from embedded reporters and U.S. military officials that the situation is exactly the opposite.

So, I hope this is a bluff... I big lie like all the others Al-Sahhaf has told.