So, I'm curious about this mod. I haven't tried to use any mods yet, excpte for the (totally) irrelevant crop tweak. 
My question is, do markets try to stock the new products of this mod, the way the might stock beef or leather? Do the markets stock milk?
yes, milk, cheese , cream and yogurt

they arent stockpiled into the creamery, they spawn on the ground inside or near the building, and they are picked up by laborers and put in barns/market. (milk spawns in cattle pasture shelters)