I believe he's talking about the map pins inside a city that show the bank, merchant, crafting hubs, etc.
They don't use the POI API which those filters and addons likely use. Instead they are called "MapLocations" and use a different set of APIs:
Code:
* GetNumMapLocations()
** _Returns:_ *integer* _numMapLocations_
* IsMapLocationVisible(*luaindex* _locationIndex_)
** _Returns:_ *bool* _isVisible_
* GetMapLocationIcon(*luaindex* _locationIndex_)
** _Returns:_ *string* _icon_, *number* _normalizedX_, *number* _normalizedZ_