That’s great to hear. Hopefully the replacement looks more like some of the recent successful replacements here. Do keep us posted on how it turns out. I’m in the same boat as you, as I’m sure many others are. It’s good to know that people are able to have Apple agree to replacements for this. I’m just waiting it out a bit to see if these later models are consistently better.
From your description I think this is what most people who are noticing a yellow tint are experiencing. I believe the green and yellow tint are linked and it’s due to how the viewer perceives the colour, whether they notice the yellow or the green in the panel more. But to add to that, I think the grey glow of pixels at certain brightnesses under 100% is a more widespread issue, which is only exacerbated by panels that err more on the green side of things at these low brightness levels, making this glow more striking and visible. I would argue that most people aren’t noticing it due to a host of different factors. For one, it can be hard to spot if you’re not specifically looking for it. In my case, I wouldn’t have noticed it if I didn’t come across articles about it, which I can say wasn’t the case for the yellow tint issue. But to add to that, I’m in the category of people who hadn’t come from an OLED device before to compare it to, so I had no reference as to how it should look like, as my previous LCD of course used backlighting. In addition to this, the scenarios in which you would spot it are quite specific. Let’s just say there’s no way anyone is able to spot it in lighting conditions that aren’t pitch black. The glow is typically quite faint too, so if you’re watching bright content, your eyes are likely not able to adjust to see it.
Going back to the tint issue, looking at the RGB grey balance graphs that you and others have posted of their panels, my case seems to align with that of bad panels which exaggerate the green far more at brightnesses below ~ 10% whilst the red and blue are more muted at those levels and in general. The green tint to greys is quite noticeable at low brightness with my supposedly bad G9P panel. So I would consider myself in the same boat as you regarding your first iPhone model before you received your replacement.