I have not. From a quick look this stuff feels like String theory, which we conveniently cannot prove. Once again, only a mathematical concept with no connection to the real world that we need to concern ourselves with. It's also a "theory of everything" which I have learned not to trust (these theories tend to overlook some big issues, like the fact that quantum effects only show themselves at roughly atomic scales and just assume that the cumulative effect at large scales does not cancel out).