That assumes Germany develops in this timeline as it did in AANW.
Something happening in another "Nazis won WW2" timeline doesn't mean it will happen in this timeline.
For one thing, that version of Germany never developed nuclear weapons and was prepared for the possibility of fighting a fully conventional war. I also think nukes were kept a secret from them, so they didn't even know what nukes were capable of or how they could change the face of war.
This Germany has nukes and is well aware of what they can do, having used them on the Soviets and seen them used against Japan. The kind of unsustainable military the AANW Nazis had isn't likely to exist in this timeline.
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As for what I would have said if I wasn't too tired . . . It's not too much.
The Nazis tended to have a rather idyllic view of the agrarian lifestyle. There was this idea that urban life had a negative effect on the spirit of the German people, and that was one of the reasons they wanted to hand out a bunch of land to be used to form farming communities after their envisioned victory over the Soviet Union.
This is also why they'd be okay with there not being as many factory workers around as long as they were moving east to work the land, because in their eyes the land they seize isn't truly German until you have Germans working it. Though they were still pragmatic enough to recognize the importance of industry even as the fetishized farming. They did have plans to build proper cities in the east, and for the various settlements to have limited forms of industry after all. (You'd be surprised at the things the Nazis could be pragmatic about even as they ruthlessly pursued other, less pragmatic policies.)
As for where they expected to get the manpower . . . Babies. So many babies. They wanted it to be normal for German families to be rather large. They provided a number of incentives to couples that had a lot of children, with the incentives you got being greater the more children you had. They even gave out special medals to mothers with different grades as you had 4, 6, or 8 children.
You might point out that such a thing wouldn't be a very fast way to replace factory workers, since those babies have to grow up. They knew this. They were fully aware that settling and fully Germanizing the conquered territories wasn't going to be a fast process. That it would take generations of work to complete their grand designs. That they wouldn't live long enough to see their vision fulfilled.
But the fundamental idea was that the German people would pop out enough babies to eventually replace fill up any lost factory jobs as well as provide the numbers to properly work the conquered lands and fill them up with a robust German population and . . . Well . . . I think you get the idea.
As I believe I said earlier in the thread, they hoped to have a population of 300 Million by the year 2000. Something the United States was unable to achieve, and it already had a larger population than Germany in WW2. (That being said, they could still come pretty close to hitting 300 Million by the year 2000. At minimum, I'd expect 250 million Germans by then.)