Seems as though he is wanting to be a closet ninja.
In addition to the self defense, other requirements include:
New Japanese/ Martial arts terminology.......because the old stuff is just no good anymore
New Rolls......ever tried to eat an old roll, you could chip a tooth
New Ninjitsu Kuji-In.......not going to touch that one
Intermediate/advanced rank includes required weapons training and advanced Iron Palm....which you will be sent somewhere else to learn because I don't know it