Why does backlight bleed keep coming back up in this thread? Respectfully, please stop hijacking the thread. Go back to the first post. This is about DSE, not backlight bleed. Backlight bleed is a common issue in LCDs, DSE is not (at least not for laptop screens; different story for TVs).
Back on topic: To re-iterate, I have gone through four MBA M2s during a span between December to March. Each one had varying levels of the same issue identified in the first post. Admittedly, if I had received the last one first I probably wouldn't have noticed the issue. But because I know where to look, I can't unsee it and it's 100% there.
To be clear, if you have an M2 Air and you don't notice any issues with its screen, please do not look for it. Once you see it, you cannot unsee it. It's a curse. Just enjoy your laptop and move on. I am hoping Apple will be fixing this behind the scenes, but ultimately this laptop is going back for a refund. I've given up.