Are you referring to Macuser Germany forum?
If I understood correctly there was someone who has seen 20 units all showing this red glow? I'm not sure I understood that message correctly??? If so I think with my luck, exchange does not help since usually if there is like 20 faulty units in million device, I get at least two of the faulty ones.
I saw that one about perfect screenshot, but no additional posts from the same person after that. But if I understood that message correctly even that one saw red shimmering in some angles and I'm not sure how that photo was taken but looks a bit like from "good angle". Also depending on camera settings it vary how it looks in photos.
I'm thinking that those who are seeing this issue likely see it with replacements too, unless there is different type panels used in some batches. From what I've heard sensitivity to these kind of issues can be pretty individual. I mean night vision is very individual and even depending on what you eat can make a difference to that. Anyway interesting to hear if someone seeing this issue manage to find a new unit without it. I don't think I change my view on that until this happens.