Also, if all you have is a dual model, then it’s equally accurate to say entanglement arises from spacetime. Eg, this article describes entanglement giving rise to wormholes, but the model equally says wormholes give rise to entanglement.
They’re promoting their preferred frame to ontological status when you can’t use a dual model to assert more than equivalence between frames.
Welcome to modern theoretical physics. This stuff has been going on for more than a quarter of a century now. Yes, AdS/CFT was super cool when it first came out. Just like String Theory was. But both have produced nothing that people had originally hoped for. Just endless mathematical intricacies that are further and further removed from our real universe. The best that came out was some mathematical tooling for adjacent fields that had little to do with understanding the fundamental rules of the universe.