He does teach fairly openly compared to some. Though, one thing he has said about his public videos is that they are -not- the formal art itself, but "freestyle" practical, contemporary applications of principles and concepts from the curriculum. In his dojo and study groups, the classes are much more formal and traditional, and the work comes directly from his teacher's densho (scrolls).
Here is a quote from Salahuddin Sensei, regarding his publicly-accessible videos and seminars:
"Though certain principles and methods are extracted for public consumption, much is taught very privately to very small groups. The public material is more about applications. At the dojo, formal attire is worn (kimono, obi, hakama) and the kyoka (curriculum) is followed closely."
He keeps his circle of direct students quite small, believing that jikiden (direct transmission) is the only way his teacher's art can be effectively and fully taught and passed along. Some years ago, he was much more open and perhaps a little over-generous in who he would teach, and what, but had some unpleasant experiences. So, he is more cautious now. He says that admission of new students has gone back to being very traditional, the way his own teacher was:
"A formal introduction from a current student is required. These standards were relaxed for a three-year period, much to our detriment. We are an independent small system; everyone knows everyone."
So, that's how Salahuddin Muhammad rolls now. He has a great group of people, and some of them have trained with him long enough to be demonstrating some impressive skills. I think we will be seeing them doing public demos and workshops before too long. That, to me, is the real sign of a good teacher and art - that the students develop the skills of the teacher.