This logic just doesn't hold up, regardless of where the intentions behind the decision land. All those energy consumers are going to use the energy one way or another. Prioritizing nuclear+renewables just means that those energy production receive a premium for their production, which hopefully encourages further investment in building out more in renewables, which in turn continuously brings down the cost of consumption until it returns to equilibrium.

Maybe there's an argument in there somewhere around the lossiness of transmission, but I have no idea what it would be.