Highly interesting theory.
It seems to be that I have eye strain from temporal dithering. I'm pretty sure that I have eye strain not from PWM because I have Radex Lupin devices and I found several devices that have PWM but do not make eye strain to me, and vice-versa I have devices without PWM but with eye strain.
I tried to use Lenovo Thinkpad T14s, which causes me eye strain, with the patch on one eye, and magic - I can use it with almost no strain.
I have scoliosis so it seems to be that my head has a small tilt which seems to be causing BVD.