A bit late to the party on this. And this post is not about any kinks, but your comment, specifically "PLEASE READ the dev's own wordsw before assuming." I read his post before stumbling down the line to further comments about the kinks...
Having read the dev's post that it's about clearing the writers block does absofuckinglutely nothing to assuage fears or thoughts on kinks. He doesn't mention anything about what makes it dark or not. We all have our own interpretation of what "dark" is or is not. Judging it on "clearing writers block" could mean anything. Aliens, magic, a whole laundry list of kinks*, gender benders, mind swaps, time travel.... any of those can fall into "clearing creative blocks".
The fact it's called the dark path, and the dev says things like reusing MLC renders and "twist it into a neat little version one that a friend/supporter would enjoy. I started writing a darker scene" I think people are perfectly legitimate in their fears or concerns as to what that means. A lot of words where used to say very little. I'd also add that the fact words like dark scene, dark path, twist etc are used means lot of those ideas I threw out at random aren't viable, leaving more concerning and questionable content as the options.