@xplosionmind,
if you find the screen tiring, you may be susceptible to PWM. In that case, you might want to avoid OLED screens in general.

I bought the 2.8K OLED version (model 21CB007BIX) which is not from 30th edition model. Am I the only one finding the OLED display to be extremely itchy, and very tiring for the eyes?

I trusted this review about the display quality, but to be honest next to my 13" MacBook Pro 2019 Retina display the ThinkPad looks like sh*t. The colors are way too saturated, the OLED pixels showing complementary colors strain the sight...

Do you have any suggestions? I am sure that it is not a specific problem of my device, since I claimed my warranty and changed my display already twice.

You write "The display backlight flickers at 342 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 100 % and below. There should be no flickering or PWM above this brightness setting."

Unless there is a way to increase brightness above 100% you can please remove the last sentence, as it is confusing.

With the Dark mode activated how does the display fare outdoors under direct sunlight?

At this rate, next anniversary edition will have just a peel-off "lBM" sticker.

"You barely notice that this is an anniversary edition in everyday use, apart from the colorful logo as a reminder."
Ah ha, no wonder it looks so bland, like almost any other Lenovo. Again, that previous anniversary edition with the special keyboard was far superior.