My understanding is that appellate courts do not review whether findings of fact by the lower court are true, but do rule whether certain evidence was properly admitted or improperly excluded. If Mr. White's prosecution was tainted by racism then this mishandling of his trial would certainly be subject to appellate review. That is one of the reasons that courts of appeal exist.
I think it is transparently false to claim that Mr. White's prosecution was racist. He walked out of his house and shot an unarmed young man in the face at point blank range. Why wouldn't he get prosecuted for this?
Some drunken white trash meat head was charging onto his property. Mr White was justified, peru understanding of the case, and the little gabbaghoul should have thought twice. But then again, this is Lawn Guyland, Aja LIdiot land where the cops are “always right” and drunken coogine thugs are always “nice little boys.”
But it seems this guy was pardoned by the governor. He didn’t win any court appeals.