Oh ok, what you say,
I had no idea the term refered to a specific subpopulation in Indonesia, I am using "Indo" as a reference to the roots of the name "Indonesia" which is a conjunction of the greek term "Indos" applied to the other greek term "Nesos" which means... yes, islands.. (simply said in other words : the native people of indonesia, without having to type "indonesian" on my keyboard each time)
That said I am also using the term "gringo" which you could also have nitpicked I should have used "bule" instead, since I am also encompassing Spanish or even SouthAmerican guides in Indonesia (there are) into this category,..
I am not sure though it matters with the issue of local guides knowing the reefs better than the bule.