Wow, I feel seen by this post. Everything you mentioned is true of my MBA M2. It's BTO (16gb/512gb) and I am now on my 4th try at getting one without DSE.
This most recent replacement is my last chance. Apple is no longer willing to acknowledge the issue and has said that they will no longer offer replacements. So I have to choose whether to put up with it or return it. I bought it during the Black Friday sale so I'm hesitant because I'd lose my BF offer on it. I may consider trying to do a repair on the screen instead of a replacement of the laptop, but I'm not sure if my return period would be affected by that.
Getting to the point: This 4th laptop still exhibits the exact same issue as the first 3, but to a lesser degree. It's 100% still there, and it's still annoying when scrolling through the web (most websites have white backgrounds), but it's not as bad as my previous one which also was exhibiting other issues like keyboard popping.
It feels wrong for a laptop at this price point to feel like it has a dirty screen that I can't clean.
If what you're saying is true (it's affecting BTO only) then potentially a repair on the screen might be the trick? If they replace the screen with one from a different vendor then it might not have the same issue?