The 500kW almost certainly includes the cooling losses. The chips alone theoretically consume power roughly according to the Landauer-Von Neumann limit, which would be less than microwatts for the shoebox they describe. In real life it’ll be more due to the switching flux and EM radiation generated but I think still much less than a watt. Liquid helium cooling and pumping through the chip is super inefficient which is where 99% of the energy is going.