if you dont have more information about the BP, then it just came to be a yellow ghost because someone somewhere for some reason called it that. You need something solid, like: the breeder who produced it sourced all his initial hypos from breeder XY, who is well-known to be working with that line.

who produced it, and where did the breeder source the hypo genes he is working with?

otherwise, if you do not have more infos that could back it up, i think its just a hypo.