I can confirm that as of Dec 14th 2019, Samsung still has not fixed this. I have a 2080 super and a 55" Q70r which are both running the latest software from their respective vendors. When you enable VRR on the TV (either standard or utlimate), the Nvidia driver picks up on it and gives you the option of enabling g-sync compatible mode for the display. However, once it's enabled, the screen will just turn black every time the frame rate fluxuates. Given that this works on some of the newer LG models, it looks like this is purely an issue on Samsung's side. I hope they're reaching out to Nvidia behind the scenes to have them help get this implemented correctly, because it could definitely impact some of my future purchasing decisions if they don't.
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