What issue did Elon Musk identify with the Social Security Administration's records?

According to the clip, Elon Musk identified a shocking problem in the Social Security Administration's database where millions of deceased individuals are still listed as active, including millions reportedly over 100 years old. This discrepancy creates potential for massive fraud within the system. The Government Accountability Office reported more than $236 billion in improper payments made in 2023, including payments to deceased individuals. The investigator in the clip questions how many of these supposedly centenarian Social Security number holders were still receiving benefits, emphasizing that such a situation would constitute significant financial fraud against taxpayers.