Really? Did you bother looking at what you linked to? 2023 data:
View attachment 1042871
Every disengagement for a driverless Waymo was for an "In-field retrieval". i.e. exactly what @2daMoon said. (No amount of remote assistance being required is reported.)
I did. Not sure what document you're extracting this from, but it's not the one I'm looking at. Also, their definition of what disengagement is, is quite clear:
Program are required to submit annual reports to share how often their vehicles disengaged from autonomous mode during tests (whether because of technology failure or situations requiring the test driver/operator to take manual control of the vehicle to operate safely).