They keep the discussion very high level. The topic is much deeper, but they appear to be constraining themselves to a single-timestep-state. If they loosened up the state to include two timesteps then a lot more could be parallelized. Since the simulation and graphics are in lockstep, this would add one frame of latency. One frame of latency is hardly noticeable against the 7-10 frames minimum added in multiplayer but the payoff could be massive. It’s hard work, without a doubt. An example I like to point to is the minecraft mod “tickthreading”. It was never stable, but the concept is there and sound.