Many of Rob Bryanton's ideas are consistent with the Many Worlds Interpretation, and his critics fail to recognize that while he is using scientific knowledge, theory, and in particularly the Many Worlds Interpretation of quantum mechanics as his foundational axioms, he is well aware that his theory of reality is not accepted by mainstream science, and in fact would be considered irrational by conventional scientists which rely on a deterministic mode of thought, including the MWI of quantum mechanics. As a result, Bryanton's theory of reality would be considered fringe science de facto, and attempts to invalidate his ideas simply because they are not compatible with mainstream science are arguably misplaced.
Bryanton's ideas really can't be considered definitively right or wrong, since they are well within the realm of metaphysics, an area far more subject to interpretation than conventional empirical science. Since the dimensions he proposes are quite literally "imagined" (that is, they can't be confirmed or debunked through observation or experimentation), his "Imagining Ten Dimensions" is more correctly understood as a philosophy that builds upon bleeding-edge scientific ideas, such as the MWI, to provide context and scientific relevance to his ideas.
His haphazard usage of scientific terminology, literature, and implicit support of many groundbreaking quantum physicists is certainly a mixed bag; on one hand, his lack of formal education and absence of published peer-reviewed work make him an easy target for skeptics; on the other hand, the resulting controversy generated by Bryanton gives him free advertising, bringing a self-sustaining flood of both supporters and haters, the intense reactions of both sides generating enough traffic for him to make a living on YouTube views alone. While this doesn't necessarily damage his credibility as a theorist, whether of the autodidact or academic variety, it certainly does invite questions about his motivations.