First, the word "racial" simply means relating to race. It's the completely wrong word to use to get the point across. Drawing a black person with dark skin, an Italian with olive-ish skin or a Swede with fair skin is "racial." The word whoever sent that message need to use was "racist." Second, it is not racist. If the character were drawn like that in every panel, then sure. But he isn't. It's pretty clearly just an unfortunate mistake that should have been caught but wasn't. End of story.