You're neglecting the fact that the complexity of an economy scales with computational power and algorithmic efficiency, meaning the simulations of the economy

You're neglecting the fact that the complexity of an economy scales with computational power and algorithmic efficiency, meaning the simulations of the economy can never catch up to the economy in fineness of detail. Economic activity can only be effectively coordinated through decentralized market calculations that a centralized computer simulation cannot match, that incorporate the vast troves of private knowledge that a governing authority is not privy to.