The procedure calls for a 'dusting' which, to me, is light. Used that way it probably isn't salty but might well be if more is applied. (I don't 'dust'--but I don't use the BRITU rub either.)
The procedure also calls for saucing with a KC Original-honey mix which would seem, to me, to make the rub superfluous at best, especially if only lightly applied in the first place. I like rubs with more flavor and not so much sugar; apply more than a dusting because I like barky ribs; never sauce ribs during cooking or before serving, and will refuse them if they are served to me that way. But the combinations of rubs, cooking techniques and serving styles are limitless. Try many till you begin to see which way you like best.