That doesn’t mean we need more power. It just means the requirements of ZK proofs may need specialized equipment to process them efficiently. Different problem.
In other words:
Switching to PoS, removes power allocated to GPUs for ethash mining. Adding ASICs for zk creates a requirement that doesn't exist today, for using power.
It’s like saying the internet needs more energy to run when a new application is developed. No, the internet is the same, it’s the application that now needs energy. So while the total energy the internet uses has increased, it did not increase the total required for the internet to exist itself.