"On October 10, 2001, al-Zawahiri appeared on the initial list of the U.S. Federal Bureau of Investigation's top 22 Most Wanted Terrorists, which was released to the public by U.S. President George W. Bush."
You're right. This has been coming to fruition for many years. Biden had nothing to do with this, other than final approval and some publicity photos. It was almost certainly the result of al-Zawahiri being stupid enough to allow the CIA to develop clear patterns of visibility and behavior. No doubt regular appearances out on his balcony made things much easier!