Even taken at face value, it means that they purposely built the ability to have an ad pop up not just on the main menu screen, but anywhere... or at least (giving them a strong benefit of the doubt) on the map screen.
The "error" was that someone popped it into the "show up on map" area of their code and not the "show up on the main menu" area of their code... but the bigger, more glaring problem is that it is even allowed to be a thing that exists as an option.
So even with all that allowance, the fact that it can be a thing is absolutely terrible and it doesn't matter that it happened as an accident, but it shouldn't be an option regardless... is the point of my rambling.