I'm not sure I follow your interpretation of embedded taxes in regard to what Boortz and Linder discuss in their book.
Embedded taxes refer to those taxes which are spent for components or products bought by the retailer (for instance, if I'm a baker, when I buy sugar for my cookies, I have to pay a sales tax on that sugar, plus the sugar's embedded taxes from the sugar refinery, which must buy the sugar from the cane producers, who must buy it from the cane farmers, who must buy land for their farms... etc etc.) All of those individual taxes add up and divide out, so that a little bit of the cost of paying all those taxes ends up in the sugar that I buy for my famous sugar cookies. Under the FairTax, however, embedded taxes (all those taxes added up from buying the sugar from the distributor who buys it from the refinery which buys it from the farmers which rents the land from the landowners) would be removed, thus lowering the cost by, ON AVERAGE, 22%. That number would obviously change depending on the goods in question, because not all goods go through the same amount of production, and not all goods are taxed the same. The basic idea is that, regardless of actual reduction, prices would go down by, on average, the same amount as the FairTax itself, meaning that all produced goods would AVERAGE OUT at about the same amount, on top of the elimination of federal income taxes, SS taxes and Medicaid.
Unless I've totally missed your point.