My Ric is set up with no visible relief. I did not use a laser to measure it, but it's visibly flat. John Hall has stated that all the demo instruments sitting around at the Ric factory are "ruler flat". That is how they are designing their instruments. Then they state in the owners manual to set with the littlest relief possible. The smallest amount of relief I achieved was none. Same with most of the other experienced Ric owners here.
I'm going by experience, experienced users, and factory recommendations.
You can use semantics and speculation all you want, but it doesn't really change a thing.
The only semantics I see are highlighted in your post above. Which is it? No relief? Minimal relief? No "visible" relief? I get confused with all this double-talk.....
None of my current instruments have "visible" relief......depending on how I look at them. But, it's there. It's all in knowing how to measure it.
But, here's a hint: ALL instruments have an optimal setup that includes minimal relief. Hall's instruments are no different. It's things like this that are confusing to new or perspective RIC owners. Even the revered Joey describes a methods of setting RELIEF on his setup page:
http://www.joeysbassnotes.com/Rick_maint.htm
Please note that he mentions the width of a sheet of paper, or a plinking sound that is audible at the 9th fret with the first and last frets depressed. That is RELIEF, which means that his necks are not "perfectly flat."