True Tone is a feature that is based on a calibrated baseline - so it literally does nothing without that calibration except change the hue to one that is not actually True Tone.Nobody is expecting those features to work at Apple specs. The brightness, contract, and heck, the resolution may be different because you can replace OLED with an LCD.
If you want to go down that rabbit hole, why even let the display shown an image in the first place?
We already know it's a third party non-OEM display. It's has a warning under Service History in Settings.
I guess just don't understand the fuss about disabling a "feature" that doesn't actually work properly in the first place- aesthetics, they-think-it-works perception... whatever.