This loophole seems to be have been included to allow Serge to discuss his own school, the Katayama Hoki-Ryu, which was reconstructed in the early 90's after being extinct for over 70 years. And that reconstruction was not without controversy itself. A review of the book is found here: http://www.hoplology.com/reviews.asp?id=4
Another look at some of the issues with Serge's books is the following review by Rennis Buchner, who is himself a practitioner of Hoki Ryu itself: http://acmebugei.wordpress.com/2010...guide-to-kenjutsu-and-iaijutsu”-by-serge-mol/