Yes I have the 9.2, but my car didn't come with it... my stupid MIB journey, on a 2015 Golf TDI S, includes basically everything ever offered (NA and ROW), haha...
MIB I (non-nav, 5.8" matte) > MIB II (non-nav, 6.5" matte) > MIB II (Discover Nav, 8" matte) > 8" glass > MIB 2.5 (Discover Pro, 9.2" glass)
You're incorrect about all Golf Mk7 sold in NA being Discover Pro. AFAIK only the 2019+ e-Golf SEL Premium got the 9.2. Everyone in this thread trying to get an update to work on their SD card has Discover Navigation, not Pro.
Discover Pro has nothing to do with the screen unless you're talking about the 9.2, which is MIB 2.5, which is Discover Pro only. Discover Pro units do not require a navigation SD card, the navigation data is stored internally. Every car that has (or came with) a navigation SD card is Discover Navigation, not Discover Pro. In fact my MIB 2.5 main unit didn't come with an SD card at all but has 2018/2019 maps on it fresh out of the box (ordered new, from my local dealer).
For a Golf R with AID (or any Mk7 with AID retrofit), if you cannot show the factory navigation in the AID and on the main display at the same time... that's also Discover Navigation and not Pro. In addition, you can update Discover Pro navigation using any SD card... none of this thread really applies to Discover Pro. I updated using the first SD card I found in my desk drawer. Anyway... I've got it uploading to Mega right now, it's about 22GB. I tried uploading it to Google Drive once before... it was taking forever.