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This is nonsense. The last 2-3 generations of GPUs have seen nothing of the sort in terms of efficiency, the same is also true of many Intel desktop CPUs. The latest Alder Lake desktop parts from Intel have been universally criticized for power draw too.

Each of the last 4 generations of mid to high-end card from Nvidia has required more electricity than the last. By Nvidia's own admission, their future chips will get larger and hotter to some extent due to slow down in moore's law and future process nodes being harder to reach. The die size of the parts has also grown which does not help.

Its not a small trajectory either; 4 years ago the most power hungry consumer part from Nvidia was a 1080ti which would easily draw 250w under load. today that number is now 500w for the current 3090ti, and rumored to be 800-1000 for the 4xxx parts launching end of this year. A GPU often will sit at peak draw for hours at a time in games as they try to push as many FPS as possible.

A current gaming machine with recent components can easily exceed 500w constant load during gameplay, and this figure will rise again with the 4xxx parts.

The ONLY exception to this really is Apple devices, and even then its not clear we can compare an M1/M2 GPU to the fastest parts Nvidia offer.