Chaotes can use whatever methods they like. They borrow whatever methods work for them, or just make up completely new ones based on a few rules.
Personally, I think Kabbalah in the Western magical use the term is a set of worthless correspondences that have no precedent in history to be used. Do not confuse this with the Jewish version -- it is completely non-related. Before orders like the Golden Dawn they just don't exist -- which means they were likely just a construct of Mathers and friends. Basically, they were creating a complex set of symbolism that may or not reflect any sort of reality.
As far as the nothing is true, everything is permitted. It's a simple way of saying that we don't actually see the true nature of reality, but rather we see its reflections -- thus no one has a monopoly of the absolute truth. It is similar to how some religions have a concept of maya, but without all of the assumptions cooked in about karma and afterlife. If matter (or even thought) is a scaffold for which the three dimensions and time hang as well as all the properties associated with the thing -- matter itself exists outside of perception we can only define it in a tautological way through these definitions we actually do not know what it is because we can't see it. (Whatever it is, it is independent of these properties which are largely products of our senses..) Magic in a chaos outlook is the same -- it exists outside of our ability to view, but we can infer it's existence via various processes -- action a yields result b. Again, a tautological definition is required to explain the unseen action... We have to infer its existence from tracking the results.
There is also a philosophical aspect that is reflected in this statement as well -- that no method of self-identification succeeds in providing the absolute truth. Too much religious thinking leads to intolerance and too much rational thinking results in the "tyranny of logic" and nihilism. All of these extremes provide relative truths at best, and we should also consider the universal random number generator to be at play as well.
Chaotes realize that all of these "selves" can be integrated as tools and use whatever aesthetics as necessary to excite their mind. The difference is they don't get sucked into the trappings of the systems like followers of them do.
