Thanks for keeping with this (do you have a Patron we can throw support your way?)
I followed your instructions above.
DVB shows in Unraid ✓
Tuners work in Plex ✓
Nvidia GTX 1070 shows in Unraid ✗
The Nvidia Unraid plugin still reports the following error
And no cards show up. I don't know of any other way to get the UUID for the card other than to go to the plugin so I can't brute force test it with the docker. And I've verified that the GTX 1070 shows up in the "Tools > System Devices" page.
Let me know what else I can check or test for you. (I'm a application software engineer but not a lot of experience in system software development but I'm comfortable in a terminal so i don't mind digging)