Cruise AVs are being remotely assisted (RA) 2-4% of the time on average, in complex urban environments. This is low enough already that there isn’t a huge cost benefit to optimizing much further, especially given how useful it is to have humans review things in certain situations.
The stat quoted by nyt is how frequently the AVs initiate an RA session. Of those, many are resolved by the AV itself before the human even looks at things, since we often have the AV initiate proactively and before it is certain it will need help. Many sessions are quick confirmation requests (it is ok to proceed?) that are resolved in seconds. There are some that take longer and involve guiding the AV through tricky situations. Again, in aggregate this is 2-4% of time in driverless mode.
In terms of staffing, we are intentionally over staffed given our small fleet size in order to handle localized bursts of RA demand. With a larger fleet we expect to handle bursts with a smaller ratio of RA operators to AVs. Lastly, I believe the staffing numbers quoted by nyt include several other functions involved in operating fleets of AVs beyond remote assistance (people who clean, charge, maintain, etc.) which are also something that improve significantly with scale and over time.