I would suspect that it's complex, most people would likely buy into it to some degree, but few would buy into it fully. As example
@varyar have mentioned earlier, that the true believers see the impoverish Swedes as equals, while the general population doesn't. So we may have a large part of the population who see it as bullshit that the French are below the Swedes in being equal with Germans. I also suspect the people buying into state propaganda will be the whose position would be weakest without it. As such the Germanified population of the east will likely buy the most into the propaganda and also be the people who embrace the SS Asatru Cult the most. In many way I suspect the former European USSR are pretty much the centre of regime support, because the population there will be a mix of people who have completely embraced Germanic identity to survive, true believers who have migrated from the western parts and opportunists, who have decided cheap farmland was worth taking it from the people who once owned it.
In the western part of the Reich you likely see people with much stronger regional identities, who buy much less into whatever the Regime sells this week.