I believe, and sincerely hope, you are wrong.
Super cinnamon/black pastel morphs do end up causing an all black snake, however black is also the normal ball python background color. If you pay attention to super C/BP ball pythons that also have another morph you will notice that often the background color of those snakes affects the black of the super C/BP.
There may be a darker lean to it, but I would highly doubt a super C/BP sunset would be all black, especially considering how many super C/BP with some other morph there are and with how most look very different from the standard super C/BP