Why do you think that they can't be turned off remotely?
They all have over the air updates. Just push the update the bricks the bus.
And when I said "Not a single bus on the road in my city can be turned off remotely", that's the truth. They can't. They're all diesel, so there's not even a remote possibility of a hidden esim-powered switch.
Why did the post I replied to claim that it must be possible for buses? And why did you assume that I meant something else, and that all buses are electric?
Edit: Typo