the nazi efficiency is defined by the holocaust and is measured against the performance of the nazis against other organizations attempting the same. the article points out that it is inefficient to kill all these skilled workers - as if the author came from an alien planet not understanding that the extermination of the jewish race (and later the complete untermensch) was at the core of the nazi ideology. as for their other actions - any country can go to war, nothing special there.
other nations have killed more, more quickly (in percentage to overall inhabitants), but mostly within their own borders. nazi germany annexed territories and then went on to systematically exterminate a race. figuring out family trees, measuring pureness (ariernachweis) then either sending you off to the camps or the ostfront (my granddad was a beutedeutscher aka loot german, enough german to be sent to stalingrad).
visit some of the camps, mauthausen, treblinka, whatever - the fact that they went from shooting to exhaust fumes to zyklon B. the fact that they systematically went trough the possessions of the arriving victims, even harvesting gold teeth and hair from corpses. the fact that they wiped out approx. 25% of poland, uprooting a large population from europe, forever.
this and other facts make the nazis the most efficient genocide machine so far and hopefully forever. could they been more efficient? of course, modern nerds with no social consciousness could come up with even better ways, or to put it that way, imagine the nerd-energy behind google/facebook/amazon/HN moved from ad-click generation to a peoples extermination.
"Fellow students remembered him as studious, and awkward in social situations." - a quote about Heinrich Himmler. "We know that these clashes with Asia and Jewry are necessary for evolution." and that is Himmler laying it out, scientifically, clear.