In the OP world Sora is Judge's wife and Sanji's mother, and Sanji was suposed to be stealth black, the germa soldier who uses the black invisible suit, but he was casted out by his family as a failure.
In the op universe there is a popular children story in the north blue, in the story Sora is the warrior of seas, the ENEMY of germa and the hero of the story, Black stealth is the black germa soldier that can turn invisible, in the one piece world they are just a story. Its unknown why this story exists or even who wrote it or even why they used Sanji's mother name as the hero of the story who opose germa.
Considering people like Law, X-drake and Hawkings know of it, the story must be at least old enough to be popular by the time these characters where children, soo its possible Judge based his experiments on that story, or that story was written when his children where very young.