Where is the energy saving here, when the miner will have lower electricity bills, but there will be more miners?
And the statements that Bitcoin "waste" energy (and consequently imply that something needs to be done about it) haven't been debunked many times?
The energy saving comes from the fact that
most of miners will spend their time on Round 1 that is not heavy-energy / CPU consuming.
At least this is the target, the bet and the hope.