Yeah the Nazi Urbanists were really mad, and i can't imagine how badly this would age.
But there is something
far more terrifying about a post war Victorious Nazi Urban Planning:
One of the Nazi Interpretation of the Heimatstil architecture ( a late 19th/early 20th movement in germanic countries to go back to a more traditional, folklore inspired architecture), ironically, was to create what are basically American-Style suburbs. The Nazi would have Suburban Sprawl.
But it gets worse, these traditional housing would be used in the colonies in the east, being "vernacular, traditional", almost close to nature, closer than cities at least, it could perfectly be used in the Reichkomissariats for german colonists, they won't exactly lack available land either.
Imagine one second, Moscow (or any other large soviet city, Moscow was supposed to be transformed into a lake but it's kinda unlikely, but you can replace it with Stalingrad or Leningrad), more than a decade after the defeat of the USSR, its population was forced to destroy it, all its buildings and old architecture destroyed, then those who survived that are forced to build these terrible, soulless Suburbs before being sumarilly killed.
It would be empty of course, the native population got exterminated and there aren't nearly enough German colonists to populate it, but it would sitll be built because of a mix of a giant money laundering project (Nazis were expert at corruption naturally), and a massive propaganda effort, it would be like those empty chinese cities around beijing but on a greater scale and with a far more terrible history.
Imagine these dead, empty suburbs spreading beyond the horizon, there would be no sound but the noise of wind and the occasional loudspeaker blaring propaganda, below them would be the bodies of millions of slaves.