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waydabber On Benq PD2705Q app works. You can select these options.
But since I specifically switched from ubuntu linux with all the GRUB and X11 codes to switch off dithering, I can confidently say - regardless what I select - its a proper "eye popper" using MBA M2 It just not good, 10 minutes and I have high tension in my eyes, around the eyes, and sight tinnitus. But app works great
Also, can confirm if you select lower bit rates and switch dithering option, there is noticeable changes to the color, mainly color tint. Presumably dithering kicks in.
My personal assumption is - apart for issues that these apps address, Apple has shipped TCON chips from questionable suppliers to some machines due to chip shortage (especially close to covid period). And this cause constant GPU induced flicker for all outputs - to build in screen, or external screen. And this is not related to dithering or PWM.