Thanks a lot to those who have replied so far!
Re:
My car is a NZ new, bought from my local dealership. I knew that there was a retrofit option but if that's the case, then the configurator is hella inaccurate...
I've included a screenshot of the NZ configurator (configurator page is redirected straight from BMW NZ's website) which doesn't call it a pre-wiring/preparation option.
Cheers!