I'm confused about it too.
Nevertheless almost all of what I know about the short tails is off the VPI website.
Maybe NERD has an exclusive morph VPI isn't working with?? (I don't recall Ivory in their Sumatran animals)
Still, it is my understanding that "Blood" should not be used to refer to any animal that is Python curtis (or the Borneo, P. brietensteini, for that matter, only P. brongersmai), and that the only "black" short tails are Python curtis.
If you clear it up, maybe you update?
Thanks.