Occluded shooting and the Bindon Aiming Concept (BAC) are actually not the same thing,
You can largely thank the USMC and the fact that Glen Bindon’s company, Trijicon was theimporter for the South African OEG occluded gunsight for the confusion:
BAC is a technique for tracking moving targets using illuminated reticle and binocular vision. It doesn’t necessarily involve occluded shooting.