In the rule change:

each City may be controlled by exactly one City Architect; the Cities controlled by each City Architect are publicly tracked.

to:

each City may be controlled by exactly one City Architect or Idle City Archetect; the controller of each City is publicly tracked. An idle City Architect may not take actions that are premised on their control of a City.

If there exists a city called “BananaLand”, and an Idle City Architect named “jjm3x3”, make that jjm3x3 the controller of BananaLand. If not, create a city named “BananaLand” with the last tracked gamestate of any formerly existing city of the same name, and make jjm3x3 its controller.