A primal world refers more to the fact that the world is completely cut of from the Imperium. I has technological capabilities, such as mechanical irrigation, early stage combustion engines and las/stub-weapons of older designs. Many of the men and women in your village boasts las-weapons and those that are not longer as capable can at least count on the security of a stub revolver or such. You and Tanvi have probably been on raiding missions against strange caravans containing lasguns which seemed newly created, however, so you do suspect that there is some sort of factorum somewhere on the world.