I mean even that’s too vague to understand the full grasp of things and Kaguya’s techniques were KKG related.
Unless you implying that her becoming one with the elements in her dimensions are considered a Light style technique?
It's basically meant to imply that there is no such thing as "light" within the context of a ninjutsu.
Within Taoist alchemy, you have the concept of the Eight Trigrams Furnace. True Yin and True Yang are fundamental forces that are next to impossible to replicate, except for perhaps through COAT, but we'll get back to that in a minute. From there you have the Great and Minor Yin/Yang, respectively, before you finally get to the Eight Trigrams. Thus, Taoist physics is a binary system consisting of Yang (giving) and Yin (receiving).
The goal of Taoist Alchemy is the Golden Elixir, Golden Pill, or Golden Flower, depending upon exactly which view of it you are taking. It is the goal of reaching a true state of Yang energy. Not primordial Yang - but still a state in which action is being performed. Within the context of Taoist physics, the state of Yang means you are PURELY giving to the world and receiving none of it. You are creating something new, existing within a state of true action and freedom of choice. Of course, it is only fleeting, as acting on the world immediately changes it and requires the process of forging/cultivating Yang to begin again.
returning to Creation of All Things - this is still a Yin-dominated release. This is not creating something new within the world, but, rather, recombining what exists within the world into a new form. Within Taoist physics, the world is simultaneously real and an illusion. It is neither fully real, nor is it as though it doesn't have consequence. Animals, for example, are considered strongly yin. They are beasts bound to the world in front of them. Action-reaction. They are constantly in a state of being impacted by the world around them (receiving), rather than striving to create and cultivate.
Something of true Yang release is entirely undefined. Whatever happens is a completely new concept to the universe. A minor yang release is possible, in the sense of creation of all things - where existing concepts are used to recompile from primitives into an existing object. But a true Yang release technique is quite literally the definition of an act of God within Taoist philosophy.