I think a LOT of the confusion here comes from the term "black back". "Black back" is a descriptive term used to describe a particular pattern type. It, in itself, is not a genetic term in the same way that "pastel" is, for instance.
When Corey Woods told his story, he tells of breeding two "black backs" together in hopes of seeing that trait pass on to babies. To his surprise, he hit a super form that he named "Red Axanthic", and therefore the founding line was called "Het Red Axanthic". This does NOT mean that all ball pythons with a black back pattern are Het Red Axanthics. The black back pattern just happens to be one of the visible traits you can use to identify Het Reds...it's not the only one.
Sometimes the black back appearance can be predictably passed on to offspring and those lines are usually referred to as Genetic Black Backs. But more often than not, the appearance of the black back pattern is as random as the number of alien heads and "eyes" within those heads.
The only way to know for sure if your black back is genetic is by breeding it out for multiple generations, or if it came from a known, proven genetic line.
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