Garbage in, garbage out. You can't change the fact that Boortz/Linder and the Fairtax.org website rely on this study for their calculations. If the study is flawed, the Plan is flawed. You need an accurate study before you can discuss your Plan.
As I think you probably know, Robbie, the authors of the book had a lot more information than just one economic study to look at.
For example, the 75 economists who joined in urging each Congresman and the President to support and pass the FairTax ALL stated that workers would receive their entre gross pay:
http://www.fairtax.org/pdfs/Open_Letter_President.pdf
And the economist Jorgenson clearly recognizes the great benefits to be obtained from the FairTaxfor the country when he says "... substitution of a National Retail Sales Tax for the existing income tax would result in gains that would accrue to workers and investors due to greater economic efficiency ..." - THAT's the real message of his economic studies (but one the Squirrels would like to have you not realize).