I hadn't heard of that, so I just did some Googling, and while some people say they've heard of kinking in super-cinnys, breeders were replying that they've never had a problem with theirs. Maybe one particular line had a problem recessive in addition to the cinnamon morph, or someone had an incubator problem and blamed the snakes.
Its a fairly common problem. Its genetic. Like problems in super butters/lessers