Why was Osama bin Laden unaware this time that CIA had leads and was after him?

During the civilian trial (instead of military tribunal) of Ramzi Yousef, the mastermind of the 1993 World Trade Center bombing, an apparently innocuous bit of testimony in a public courtroom about delivery of a cell phone battery was enough to tip off terrorists still at large that one of their communication links had been compromised. That link, which in fact had been monitored by the government and had provided enormously valuable intelligence, was immediately shut down, and further information lost.