Where is the empirical evidence that the spots under glass are in fact "dust". Anyone tear apart the display layers and collet and analyze any of this "dust"? Last time I checked my phone there was no fan sucking in outside air. Maybe this is special dust that walks on inside. Or maybe it is something else happening with like the adhesive between layers. My speculations are as valid as the next person's speculation sans actual tests.
So when I ask for evidence of your claims, the best response you can give is to ask me for mine? Sure "proves" a lot...
I haven't opened up that particular display, but I know it's not a delamination problem. Unless you work for Apple, LG Display, Sharp, or AUO, I will assume I have closer knowledge of the display module's designs than you do.