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The refresh where a page turns briefly black before displaying the text is how e-ink works, so it happens on all e-ink readers to an extent. It can be more noticeable on some readers than others. I hardly notice the flash at all on my Glo, but I also have it set to happen once every 50 pages. But the brief flash is certainly less of a disturbance to reading than if you would turn a page of a physical paper book.
That video also seems to have a really pronounced black flash, as if the reader is slowed down for some reason (such as having 3000 books in the main memory that can slow down some readers, or maybe a badly formatted book will show it happening that slowly as well).
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