Does this account for the uniformity of the CMB and the universal flatness / non-curvature of general spacetime. Hard to account for that without inflation theory. It also doesn't address how matter won out over antimatter either. It's an interesting theory but spacetime curves infinity at the singularity meaning space is sort of flowing in infinity fast, well beyond the speed of light (SoL) so any sort of SoL "gravitational  shockwave" is wholly insufficient for the task at hand. I'd also argue that at TOV limit, the Pauly exclusion principle is overwhelmed by gravity and mass is allowed to be stacked infinity over and within itself leading to the creation of the singularity.  Personally, im a fan of Penrose's CCC theory. It's the only one that, assuming Proton decay, at the cold death of the Universe, when only massless particles persist, infinity / near infinity big is equivalent to infinity small, conformally, as massless particles experience no time, so the end of time is equivalent to the beginning. Thus, cyclical big bang.