I wouldn't be surprised if the numbers were off by an order of magnitude. 1500 units with on average 2 people works out to 3000. Looking at the pictures, that feels like a more realistic number.
Took a Waymo once with some coworkers. The ride was fine (San Francisco inner City trip). What really surprised me is how normal it felt after a couple of minutes. Most people don't talk to their driver much anyway, so there might as well not be one.
Slapped about with a big fat trout you say?