According to the blurb on the back of Erreurs de Pilotage 5, Otelli is a demonstration pilot, with 14000 hours total time, leads an aerobatic team, is an instructor in aerobatics, and has written a number of books on aviation safety.
The CVR transcript from AF447 in his book is essentially identical with that published in the BEA final report. Clearly it was leaked to him not long after the CVR was read, probably by someone within the BEA.
I presume any differences between the transcript in the book and that in the BEA report arise from different interpretations of the audio.