> On M1 Air there is pwm flickering which makes impossible to work with it

According to table you linked M1 Air has PWM frequency of almost 120 kHz, which very high and well above headache and eye strain inducing frequencies.

According to my doctor and my eyes state since I've started using M1 air it doesn't matter which frequency was used by the idiot who decided that PWM is a good idea to regulate brightness of the monitor.

Also there is 60Hz flickering that doesn't go away with any brightness level.

I think it is especially bright idea to design a working monitor and then spoil it with PWM rendering it unusable. I personally consider it as a fraud and the essence of disrespecting people.

I’ve found turning the brightness up all the way to help with that immensely.

I've found it too but then the usage of it brings some limitations you know and basically makes it unusable as laptop.