In the linked wiki it makes no reference to your claimed origin, 'The term outsider art was coined in 1972 as the title of a book by art critic Roger Cardina' so my point stands, people inside the art world, a closely guarded circuit, decided that the way to define those natural artists who did not have formal training as 'Outsiders', which to me, is not a very pleasant way to describe a people that don't conform to existing paradigms, I don't accept the division, you are of course free to call it what you like.