A supertautology is a theory of reality constructed in a way which guarantees that it is true.
There are different levels of truth. Truth is usually about the inclusion of something in a set. There are superficial ways in which the truth is relative and really depends on the definition of the set that inclusion is being considered in e.g. whether cleptomania is a mental illness. Then there are deep truths that underlie all perception and without which nothing perceptible could exist. Those kind of ultimate or absolute truths are called Tautologies and a theory extracting the implications of Tautologies is a Super tautological structure.
When a tautology is violated or a theory is constructed that purports a statement in violation of a tautology, we can know a priori that that statement cannot be true or real. For example, to postulate that there is a God outside of reality is a priori false because according to the principle of syndiffeonesis (which is a tautology) ; if two objects are separate, they are separated by a medium. But if they are separated by a medium then they have the medium in common with one another and so are not separate ultimately and in fact part of the same reality. Therefore, God cannot be separate from the universe/reality if God exists.
The CTMU is a super tautological structure that extracts numerous useful implications about the ultimate nature of reality and our minds from tautologies.
In a supertautological theory of reality, it is unnecessary to assume the uniformity of nature with respect to certain kinds of generalization. Instead, such generalizations can be mathematically deduced…e.g. nomological covariance, the invariance of the rate of global self-processing (c-invariance), and the internally-apparent accelerating expansion of the system. (See MAP, M=R, MU).