@XML, the dealer seems like a lazy shite that can't be bothered sorting out your request.
The latest maps version data is a “84160883 Version 30.12.10.11“ as show within MyLink itself.
This map data is a 2018 release which in real terms means the map data is probably from 2016 or 2017.
I complained to Holden Customer Care that when buying a new vehicle, it should come with latest available firmware fixes and feature upadtes, maps included. As such they agreed and offered a gratis map updates to the latest available, offer valid for a year. So i waited until early 2019 but the last map update was the above which i had installed on Holdens dime since i was continually told no new maps coming.... And none have...
So, I'd give HCC a call and discuss why the firmware wasn't updated during delaler delivery when the car gets a once over to make sure everything is correct, otr is it just an overpried car wash.... They should provide a gratis map update that your recalcitrant dealer will them install.
As for aftermarket, nothing fully replaces the Mylink features, especially HUD intergration so why spend $1000's?