worldofballpythons.com has changed the genetic calculator to reflect it. Enough people have clutch results from enchi cinnamons that it's safe to say it's proven. When breeding a cinnamon enchi to one that has neither, every single hatchling has one of the two genes, never neither, never both. The only way to produce a cinnamon enchi that we have seen is to have each parent have at least one of the two.
There are many claims of "super enchi cinnamon" and two "super cinnamon enchi" (one of the two is listed "possible enchi") showing up on morph market (including past sales) but if you look at the animals, you have to wonder what gives the people identifying them this idea. I would want to see clutch results from these animals before making the claim they are those things if it were my reputation on the line.