Ok, that makes real question whether they do this as a matter of normal course or if this is a case of a politician "author" (ghostwritten of course) receiving special treatment.

And the answer is, unsurprisingly, that this is definitely not standard Amazon operating procedure.

Edit: I misread this comment, and agree that a review isn't a review if it's just a comment. Leaving my original comment for context of my error :-)

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No, they were reviews. See the screen shot in the article: it shows stars (in this case a one-star review) with the review commentary. Followed by: "Except that in all likelihood the overwhelming number of bad reviews on Clinton’s book were not from genuine readers, but from a concerted attack to bring down the average reviews on her page. By 3:05pm New York time, Amazon had apparently deleted over 900 reviews of the book."