Looking at the (very few) 5-star book reviews of Straight Flush on Amazon, one is by "A. J. Wolfson" http://www.amazon.com/Straight-Flush...owViewpoints=0
The only other books reviewed by "A. J. Wolfson" are Ben Mezrich's Ugly Americans http://www.amazon.ca/gp/cdp/member-r...stRecentReview and Ben Mezrich's Accidental Billionaires http://www.amazon.com/review/R17UIR94NNT98X
A bit further digging shows in this court filing http://www.aarongreenspan.com/filing...3.appendix.pdf that Mezrich was previously in hot water for posting false 5-star reviews on Amazon (see p35). The court papers noting "Such reviews constitute “advertorials”—advertisements in the guise of objective editorials written by consumers—that violate Federal Trade Commission (“FTC”) advertising guidelines."
So if this is not Mezrich himslef, it appears a source close to him (his publisher?) is doing some false advertising.