I think "driverless" here is different from "self-driving", i.e. 'Waymo uses “driverless” here to refer to operations in which the ADS controls the vehicle for the entire trip without a human driver (whether in the vehicle or at a remote location) expected to assume any part of the driving task.' at page 5 of that report.

I think this driverless mode is only available to public on Oct 8th [0].

[0]: https://blog.waymo.com/2020/10/waymo-is-opening-its-fully-dr...