I have reached out to Nikon to find the name of the service manager. Still waiting.
Meanwhile I reset the camera as suggested, deleted autofocus fine tune settings, and I shot some fresh focus fine tune-style images, without subsequent adjustment.
I found my 24-70 focuses a full 10 inches short at about 6 feet from the slanted-ruler target. My old 50 mm 1.4 also is 8 or 10 inches short. Strangely, my 105 2.8 and 85 1.4 are within 2 inches or so. I didn't bother with the 14-24.
As before, the fine tune is out of possible adjustment range.
Is self-immolation or a hunger strike a possible way to get resolution from Nikon? One of the batteries originally shipped with the camera could serve as an ironic ignition source.