This is extraordinary, but I have heard of this sort of thing happening on amazon -- and have read several 5* reviews supporting mediocre books in the area of Russian studies which certainly raised my eyebrows -- though not at such a high level of academia. However, having spent much of my life in academic circles I know the level to which some of these people can go to disparage the research of colleagues; jealousy and backbiting is endemic and egos inflate out of all proportion to reality. Alcoholic, narcissistic, paranoid..... take your pick.
I am particularly struck by this as I'm now reading A People's Tragedy and I find it riveting.
In many ways sites like amazon make it relatively easy for an intelligent individual to pull off something like this... when I read 'red flag' reviews I always check back on the reviewer's other reviews, that usually gives an indication of whether they're authentic or not.
I think if you were to look back at some of the reviews of books that most of us on this site have read and discussed, you'd see a few that would raise an eyebrow.... it can be tempting to disparage the work of another when it is done anonymously.
primrose