That's not really being fair, because the metric is presented to look like traditional perf/watt. And idle is not so important in supercomputers and cloud compute nodes which get optimized to keep them busy at all costs. But even in cases where it is important, averaging between the two might be reasonable but multiplying the loaded efficiency with the idle efficiency increase is ludicrous. A meaningless unit.

I can't see any possible charitable explanation for this stupidity. MBAs and marketing department run amok.