He talks about it only working in "Raw False colour mode" but not in Redcolor.
That thread goes on for 10 pages, with lots of DP's feeling the same way I do.
I'm often faced with dealing with contrast that is beyond the dynamic range of any camera. Every scene requires an exposure interpretation.
Your argument about deliberately underexposing the RED to get the best out of it in a comparison is meaningless to me in a comparative test. I already know I can trade shadows for headroom. I wanted to compare like for like from the middle of the exposure curve.
Trading shadows for hightlights works only so far. If you have skin tones that are too far down into shadows, it becomes more and more difficult to get them looking right. So again, exposing for highlights is a solution that works for some situations but not all the time and only so far.
In my first setup, without any adjustments other than balancing, the skin tones are exposed the same way in each camera's setup and come out where I expect them to without having to *grade* them up or down. That's what matters to me. If I'd exposed the RED for highlights, I would have had to spend a lot more time in the grade lifting everything up to match.
I chose to test what I wanted to test for. I'm sorry it doesn't tally up with what you're expecting but it tells me what I need to know.
If you really think that RED can be graded and exposed in such a way to be visually indistinguishable from an Alexa, I'd invite you to try it for yourself. And to actually do it yourself rather than relying on other tests out there.
I think you'll find that's not really true where there's high contrast. And your "1 stop" number doesn't really tally with my tests nor many others I think.
Have you seen the SCCE tests ?