Gigapress
Trying to be less wrong
I think the steering wheel or some other critical link between it and the tires can be physically uninstalled. Or the wheel can probably be locked in place. Maybe this is what you meant by retrofitting.They might just be waiting for a model of car without a steering wheel to better accommodate the passengers and avoid inadvertant steering input. (this might be as easy as retrofitting the existing Boring fleet in use there)
Tesla Network is general will need to have some solution for this because Master Plan Part Deux says that regular consumer cars will be able to join the network, not just dedicated robotaxis. This indicates that Tesla almost certainly has been planning for some method of deactivating human control while in robotaxi mode.