I dunno, maybe I get crucified for this, but I see that more as a racial stereotype than as pure racism. I think of racism as hating/judging someone just based on their skin color. Here, the black people on the cover are definitely drawn in a way that evokes a racial/tribal stereotype, but is it racist? Does it evoke hate or bigotry? It certainly doesn't foster understanding, but for all we know the white guy had it coming. I think its more of a slapstick type attempt at comedy with the people and animals of Africa being the danger element chasing after the poor white sap. Not much different than a slapstick cover with another danger element such as a gator biting a guy's leg or something. To me it looks more racist in today's context than it was necessarily trying to be. Ignorant, maybe, racist no?
Another example might be shock suspenstories 6. Is that a racist cover? I don't think so. It renders racist people but I think it shows the KKK as the antagonists, and therefore is anything but racist