Holy Crap, you mean Choson is still putting out videos? LoL. First, it is not ninjutsu. He tried to label his art as ninjutsu at the beginning but was so torn apart by people on martial arts planet and I think bullshido that not only did he change the name to something else, he also made a video apology.
The name of the art is crapjutsu. To me it seems like he just took some martial arts (more specifically tae kwon do mixed with some karate and some really bad jujutsu) and invented his own art that he tries to pass off as legit. Come on, his main dojo is utube! It's almost as bad as Dan Bowen and the Sacred Fire Dojo, also on you tube. If you want a good laugh sometime, check out the videos.
If you want to get owned in a fight, study this "art". If you want to study something real, get your butt to the dojo, shibu, dojang, or gym.