Wouldn't it be far more racist to exclude Africa from the list of potential places resident evil games could be set simply because the country has an epidemic? I mean every other country has had epidemics throughout the makings of the resident evil games but no one ever said "No, we need to be sensitive to a degree that will prohibit the development of this game", nor did anyone cry racism.
A concept or word is never racist on its own, it all depends on the intention, no one complained when we were killing under-developed spaniards who were depicted as filthy, and all of whom lived in slums while our foreign protagonist slaughtered them in mass, wearing noticeably more immaculate clothes, brandishing technology which these infected spaniards for some reason just couldn't afford or work out how to use, even though it was being sold just a few metres from their homes. We didn't complain that the implication was that all spaniards were dirty, infected and primitive farmers, because A. we know it's not true, and B. we know that the team of resident evil did not and would not place any racism in their game, considering that it would be sold world-wide.
One can't claim that including a particular section of society in africa (IE the african people who still do use spears) is racist simply because it's also been used as a racial slur in the past. Spears were used in the past and still are used today in some places. It's not racism, it's fact.