Basically this, Schreiber wants to overthrow Hitler before the Holocaust and mass killings really get going. The time traveling German Admiral is already aware that the Holocaust has already started and does not want it to continue. But in order to overthrow Hitler, Schreiber needs political power and military prestige in order to gain support for a future coup, thus he needs to win battles. And in order to win battles, Schreiber needs to make sure he has the fuel and materials to do so.It's more a case of keeping Hitler from deciding that the Kriegsmarine (and in particular, it's surface fleet) isn't worth it's cost in resources and reassigning their fuel oil to more "useful" things like his Panzer corps.
He has to be careful though since many military officers, as well as Naval officers, are strong supporters of Hitler. Hitler's political position is basically unassailable right now due to the previous German victories in Europe. Hitler's hold on power would not weaken until the invasion of Russia and the eventual German defeat at Stalingrad. The Russian victory at Stalingrad and later at Kursk is basically when many of the smarter German generals realize that Germany would lose the war.
So Schreiber needs to bid his time and play his hand carefully.
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