They claim that they want to deliver the Clerics edict that he leave their homeland.
Apparently they are feeling pressure to distance themselves from bin Laden, even if no one believes them.
There are still a lot of disgruntled Afghans (civil war is still going on) that could rise up against the Taliban and ruin bin Laden's "vision" of uniting people of the Islamic faith in a Jihad to murder all Americans and nations that side with America.