I have bought Lenovo X1 Yoga gen 3 with WQHD high quality touch screen. Based on notebook check no PWM, initial view also does not show any PWM. And although it is from 2018, it is almost brand new, screen is amazing, just as macbook screen, probably better. It has wifi transmit power control which I like to have in order to limit any background EMF exposure during long days. Will update later on any symptoms, as I did not have a chance to use it long enough.
Btw, my previous laptop HP elitebook 845 G8 had the most weirdest symptoms for me EVER. Spec wise it has all the good panels from CSOT company FHD (or I assume so), but it caused chest pain and fatigue. There are people on internet say the same. And I think it is something to do either or both due to low frequency PWM or which is also very likely, wifi antennas in the screen and EMF sensitivity. Either way, this laptop caused me chronic fatigue, and I was active person - gym, jogging etc. Maybe its wifi adapter transmitting much higher EMF that maximum allowed, maybe its pwm, maybe its something else, but forums also write a lot of similar things about this HP live. I have no clue what is a real cause, only thing can say, this is not overworking, since I did take breaks, went for short no laptop time, and after coming back immediate strike to the chest and weird drain.