Does the cocoa powder go in the base or the topping. Looking at the photo, I'd guess the granola base?

yes, the cocoa powder is listed with the bar base ingreds so that is where it should be added. I must say, how does something like that not get corrected before it is chosen as a CP?!
BTW, many recipe chefs rarely see the hotline or check the comments on their recipe pages. So when i have a question that i really need ansswered, i click on the chef's recipe and then from there i click on their name; and then on their member page, i send them an email by clicking on the envelope symbol. those emails go to them directly.