Point been made is about Germany doing total mobilization of economy late, not that Germany did not switch economy to military footing. Those are too different things. Or it other words it's not about Germany not mobilizing it's economy, but rather about Germany not mobilizing it to the maximum.

Essentially claim is that Germany did not do maximum it could and did not use all resources it could to maximize military production earlier in the war. And that's evidenced by the fact that later in the war Germany indeed did it.