Huelight made some profiles that was popular in RawTherapee a number of years ago, I guess it's still the same person behind it. Great to see that he can get some extra income from the special knowledge.
The available software tools for making and tuning own profiles are not very good which is a bit surprising I think, but it's the way it is. Making accurate reproduction profiles is easy and software exists for that, but when it comes to subjective colors the tools are limited. Manufacturers like Adobe, Phase One etc use custom software not available to the public, and I would guess Huelight has his own tools as well.
I wonder when someone will make a camera profile software available to make really good subjective color profiles...?