floglso I have no personal experience with this device but I wrote about the Poco F4 GT which uses a seemingly similar OLED display with the claimed 1920Hz PWM frequency here
In addition I'm not going to put anyone on the spot but I read somewhere else that someone tried the Magic4 Pro and claimed that it caused the user eyestrain while another device that was advertised as supporting DC dimming did not. It was speculated that the fluctuation curve/flicker percentage may have been the issue.