What was.... is

This is a good article, but as usual mostly one dimensional when it comes to time and space-time: The Universe already does its own reverse engineering of time and space-time, and the front end initial instrumentality is blackholes (ends to endless beginning):

One Lab’s Quest to Build Space-Time Out of Quantum Particles | Quanta Magazine

What many suppose was (time and space-time-wise).... the Big Bang horizon.... is and always will be (time and space-time-wise).... the Planck horizon.