He stripped the inheritance layers. He deleted the 'Smart_Assist' class that had been responsible for the pizza-grease shine. He went back to basics: Channel A, Channel B, Blend Mode.
Warning: Official distribution ended in 2014. The following sources are for archival and educational purposes. multitexture 2.04
That’s three stages. But 2.04 introduced that let you fuse Stage 1 and 2. You'd output the dot product into the alpha channel of Stage 0’s result, then in Stage 1, you'd do RGB = Prev.RGB * Prev.A . He stripped the inheritance layers