Oh interesting.... I am not an expert on this by any means, but if it's synced with the refresh rate, there is still a flicker, correct? I mean my wife has a 14 Plus, and if I take a slow-mo video of it, I still see flicker on it like I do on other OLED iPhones- though it admittedly doesn't look as bad as others.My theory is that apple was experimenting with synced PWM, matching it to the refresh rate. If you look at the graphs they look much closer to DC dimming than other iPhones.
I just don't quite understand what that achieves (or attempts to achieve)- I might just be dense. lol