If you're in the city a car shouldn't even be a major consideration (ideally).

Yeah, so few households that still own a car but don't use for commute choose cheaper ICEs that require no attention during weekdays. Then company cars driven weekdays when necessary remain ICE for familiarity as well as various EV chicken and egg problems.

There is no electricity in Tokyo?

The canonical American setup of a house with a garage where you can charge your car is exceedingly rare in Tokyo. Most people live in apartments and don't have cars, and even suburbam houses rarely have garages. If they have cars, they're parked in the apartment garage or a monthly contract parking lot, neither of which has charging.

It's a solvable chicken and egg problem, and China cracked it, but for time being Japan is way behind the curve in EV adoption.

Robotic parking but not charging as part of it seems odd.

That's true for majority of cases, but a small percentage of Tokyo that needs to visit places taxis and trains don't go is still a large number.

Thinking 10 years down the road, will autonomous rentals be geo-fenced and not suitable for multi-day trips to rural places?

A car should always be a major consideration for someone's needs. Especially if you have a family with young children or are disabled. Discounting cars as useless because mass transit exists is a terrible idea.

Unless you live in a city that has mass transit that actually works.