I understand that, but the problem is the tint is uneven. This isn't about basic color temperature settings anymore. It's simply something is fucked up with display that caused the tint since it's not the entire screen are yellow evenly.
All the photo online that you can find with yellow tint issues on iPhone 7, they all have the same problem with bottom part of the screen have heavy yellow tint compare to any other area, and left side is slightly more yellow to the right.
Also, changing the color filter doesn't really fix the problem properly. It just make the white more cooler and screwed up other colors at the same time.
Article also says sometimes it disappears after a few days as some of them is an adhesive issue not cured completely yet.