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That only applies to peace time and the first couple months of WWI. By 1915 all the 1st Ban Landsturm solders (i.e. young untrained Ersatz Reserve) would have been combed out for use in regular and reserve infantry divisions.

People are trying too hard to project the manpower shortages of mid 1918 into mid 1915. Simple arithmetic shows that 1915 Germany has no manpower shortage.
1907 Example
Number of men liable. 556,772.
Physically unqualified. 35,802.
Voluntary enlisted before required age. 57,739.
Sent to Navy. 10,374.
Available as army recruits. 452,857.
Assigned to active military service. 212, 661.
Assigned to Landsturm. 240,196.
The items in red are the important ones. 1914 Germany had more 1st Ban Landsturm soldiers then trained (active duty and reserve) soldiers. Enough Ersatz Reserve soldiers to create maybe 80 new infantry divisions as soon as field artillery becomes available.

Field artillery was the critical bottleneck in the creation of new army divisions for Germany so let's look at this more closely. A 1914 German infantry division was authorized 54 x 7.7cm field guns (I will omit howitzers, mortars and the switch to a triangular division structure in early 1915 to keep things simple). Germany was producing about 100 field guns per month in early 1915, which we will use as the monthly average during the first year of the war. So Germany has produced roughly 1,200 new fields guns by the summer of 1915. Enough artillery to create about 20 properly equipped infantry divisions, leaving a 60 division manpower surplus that is still waiting for weapons. To this number we need to add the roughly 500,000 new recruits from the 1915 draft.

But what about casualties?
Unlike everyone else, German army casualties were relatively low until mid 1916. Total Heer dead and missing through the end of 1914 amount to about 300,000 soldiers. This number climbs to about 950,000 by the end of 1915. As of mid July 1915 the Heer dead can be replaced by using surplus Ersatz Reserve soldiers.

Bottom line.
1915 LettersTime Germany does not need their Landsturm battalions. The Heer is hanging onto them just in case they might need them. The same reason that the Kaiserliche Marine is still hanging onto antiques like the 12 x Wespe class coast defense ships commissioned in the early 1880s. Both the Heer and the KM need to conduct some realistic house cleaning before complaining about a shortage of resources.

SMS Wespe SMS wasp

(SMS Wespe [Typschiff Panzerkanonenboot] ist baugleich mit SMS Hummel) (SMS wasp [Typschiff armored gunboat] is identical with detail Hummel)

If the KM adopts that attitude then the Heer will also. So don't expect the Heer to start disbanding Landsturm battalions to release naval shipyard workers.