The image originates from a sense that black people are bad or scary, and that it's something like "the only good black person is one who looks and acts like a house slave." It's a positive stereotype because although it sounds nice, there is still a racist premise involved. You know, like the stereotype that Asian people are good at math. Yeah, it's good to see somebody is good at math, but it's also racist.
Besides, logos change over time anyway because images gain different meanings and connotations over time. As far as business goes, if you can make a better logo, then do it. If stereotypes are involved, more the reason to change it.