I'm pretty sure if they were better than humans by any real statistical margin they would be trumpeting that in press releases. The fact that they work so hard to maintain such secrecy- only revealing data that they are legally mandated to- suggests that they, the people must familiar with the system performance, think it is inadequate.

In essence, because the people who control the data have an interest in revealing data that is superior to human performance, the lack of conclusive data on this leads to an inference that it isn't.