Manpower is people available, not joining. The only thing a conscription law can change is the range of age where you recruit
Yes, that's the point. You can radically change your available manpower if you say, decide to include 14 year olds in the front line as Germany did towards the end, or give untrained 55+ year old illiterate peasants (who couldn't even speak the same language as their officers) a rifle as the Soviets did, but that's all a choice of the leaders, not just raw population per se.
Or even modern militaries will remove previous exclusions (such as accepting some medical conditions which were previously off limits) to "increase the pool"
So Austria only has 150MP but then Germany suddenly gets 500? Simple - they changed the rules and suddenly a lot more Austrians are now eligible.
I think it's a reasonable attempt to model that Axis and Comintern countries can get away with being much more horrible to their own populations that what would have been likely tolerated by most of the Allies.
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