Waymo's people don't remotely drive. Waymo wasn't willing to trust cell phone network latency. They just give hints to the car's control system, like "turn around and take another route", when a car gets stuck.
Yes, and your link says that "Tesla's setup appears to be similar." I haven't seen any real evidence that Tesla's remote operators will actually drive the cars.
"Fleet response can influence the Waymo Driver's path, whether indirectly through indicating lane closures, explicitly requesting the AV use a particular lane, or, in the most complex scenarios, explicitly proposing a path for the vehicle to consider. The Waymo Driver evaluates the input from fleet response and independently remains in control of driving. This collaboration enhances the rider experience by efficiently guiding them to their destinations."[1]
It looks like the way this works is that the vehicle first has to come to a stop autonomously, and the control center then gives it instructions on what to do next. It's for getting out of stuck situations.
California's CPUC permit for Waymo operation does not allow teleoperation.[2]
Reviews of the job on Glassdoor indicate that it's more or less OK. No opportunity for advancement, but snacks are included.