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While their logic maybe sound, the execution is impractical. They may have stopped single influencing reviewers from posting, but there are companies where you can hire armies of fake reviewers for your sites. As Kind mentioned, authors have these thing called "websites" and if they ask their loyal followers to launch live baby seals into the atmosphere in plastic bags, most of them will do it. So, asking them to go and post a nice review is even easier and could a lead to a significant number of positive reviews being posted based upon a favor as opposed to a real opinion.
Amazon makes me laugh. Ha Ha.
P.S. For the record, no one has ever asked me to launch live baby seals into the atmosphere in plastic bags.... yet.

