Sure, taxibots (‘taxis’) will reduce the need for cars. But what about rush hour when ‘everyone’ wants to be on the road at the same time? The simulation appears to assume use of high capacity public transport to cover those periods.
If so, why hasn’t that happened already? 90% of commutes use personal cars, despite all the downsides of rush hour driving. Taxis will make private commutes much quicker and much more pleasant, but won’t solve any of the downsides of public transit.
If anything, we might predict that inexpensive taxis for those who can’t afford personal cars might reduce public transit use.