@Pervage @BPM I'll copy my answer from another thread on the same topic:
Since launch we have made several improvements to the ROG Phone 3 display, much thanks to user feedback here on Zentalk.
We are still discussing potential ways to optimize display performance further, but it's not a simple question of adding a few lines of code and be done with it. As such, take any user-made solution claiming to "eliminate black crush" with a grain of salt.