I don't know what it says either. The economic and ethical rationale for putting this sort of restriction of a peripheral is baffling to say the least. There's no technical reason for it.
Well since it is a firmware issue, we already know the technical reason. At it's worst, Nintendo would be trying to price fix the controller prices across different regions.
So Nintendo thought this was worth prioritising over something else the console didn't support (like DLC), inflating the day one update more, because some big bad mean consumer might import a controller?
Yes, I'm sure this took weeks to implement, if there even was an implentation besides giving controllers their own firmware.