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I think Moore's law was just about compute capability, not energy consumption. I could be wrong, though. That being said, processors have become more efficient. I think the other poster was saying that our code complexity often expands to fill the voids. Obvious examples are neutral nets, render farms, crypto mining. But then there is the cost of React vs vanilla, electron vs native. Efficient processors don't necessarily mean less energy consumption, though I think in general that had still proven to be true.

The way Moore's law worked was that ever more fraction of energy was being used for compute instead of fort waste heat.

I deal with low power microcontrollers. They keep using less and less power while running faster.

Old Z80 based board I first worked on drew 1A at 5V, so 5W. Put your hand on it, it's nice a warm. Current board I'm dicking with draws 8ma at 3V or 0.024W. 200 times less power. But it's 50 to 100 times faster.

Dennard scaling is a pretty fundamental part of Moore's law.

Moore's law is dead, however.

Electron/Chrome undid any gains from Moore's Law. A native IRC client takes negligible amount of energy compared to Slack (I can almost double my laptop's battery life by closing Slack and using weechat/irssi instead).