I think that white ebay car would have proved the theory I had if it had a red stripe. But my guess is that the black stripe on that car now is correct, being a nice survivor that was restored, why would they have changed a red stripe to black. You usually copy what was there.
That car is not a survivor. It originally was a L65 car that has been made into an SS350.
I'm not convinced your car is an exception, but with only one datapoint, it's hard to make any conclusions.
One thing is for sure, it's a minor paint 'rule' that wouldn't affect many cars.
Black with a green roof - I missed that combo. Thankfully, I've never seen one like that....