Gotta love using Joyce as a translator. It took him 7 years to write it and then it was banned as pornography by many. Hate the messenger.....There was some animosity between the two (LA and TT), but my reading is that because the USADA inquiry is a rare look by the authorities into the doping culture, Tygart only got confused by the magnitude of the individual facts, and thought that his "Ulysses" described something totally 100 % unique with its hundreds of footnotes and thousands of pages of supplementary material.
The inquiry was unique, the subject necessarily not so. The inquiry into Mr. Bloom's day in the year 1904 was unique, his solitary vices in the beach necessarily not so.
There can also be public choise/ bureaucratic reasons. Of course anti-doping crusaders -- who can have also a real shortage of money -- must show also that they are effective in saving souls (ie. destroying "the most sophisticated doping program) of the most evil people ("monsters who coerced children into doping use").