The FTL simultaneity is replaced by the'Relativity of Simultaneity'-which effectively defines a weak simultaneity locked at the speed of light, this weak simultaneity then defines the causality for the whole universe.
The FTL simultaneity is replaced by the'Relativity of Simultaneity'-which effectively defines a'weak' simultaneity that is only defined by the speed of light, allowing space to fold without limit above the speed of light. This weak simultaneity then defines the causality for the whole universe.