A fair point about the difference between additive and subtractive. But I think you're missing something.
Cyan reflects Green and Blue light.
Magenta reflects Red and Blue light.
Red, Green and Blue light makes white.
So putting dots of Cyan and Magenta next to each other will give Red. Similarly for other combinations. So I think it is theoretically possible to do a display using CMY pigments with side-by-side cells, not layered.
We'll have to wait for people to examine the display in close-up to find out for sure.
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