Ahriman
Tyrant
No; I look in the maintenance hover text in the city screen.Colony Expenses seems to be zero whenever I hover over City Maintenance in the Financial Advisor for all players. Is that where you are looking?
I don't think the financial advisor distinguishes between the two.
AFAK, it only shows up if the city is not connected to the landmass that your palace (or forbidden palace) is on.
Take a look at attached save.