Ah, so for most of us LED itself is not strictly the problem. Low quality ones with a low refresh rate, like in some department stores, are a problem.

It is likely other sources of flicker like temporal dithering (FRC), you can see it here (it is on Windows too): https://youtu.be/0y-I3hqQgCQ

The visual noise/dots you see is the dithering. The e-ink display is slow enough so we can see it.

People with BVDs are strongly affected by that noise...and unfortunately simple pair of glasses does not help.