Was it really unneeded?
Let's review
1. Prussian Uprising begins on April 11th with carefully planned attacks on Polish occupation forces. 2. Rebels are found to be using weapons originating in China, although tracing their movement from Asia to Stettin proves to be impossible. 3. After five days of fighting, as Polish and Philippine forces seem to be gaining the upper hand against the rebels, all Treaty troops suddenly withdraw from Stettin at sunset on April 16th.
1, Carefully planned attack (i.e. professional) attack against Peacekeeping troops (who actually function more like a U.S. State Patrol or State Police primarily, but not exclusively aimed at ensure the Treaty prohibitions on Weapons and weapon tech are being followed, while also serving as a "heavy SWAT" team for local police in case of bank robberies or hostage situations). The Poles, especially, are good, their forces rotate between working in the Statelets and as peacekeepers as requested through the UN elsewhere, including on the Chinese/Korean Border. Despite that they were taken completely by surprise attacks against multiple locations across the entire region.
2. The rebels were not using WW II surplus weapons or double barreled hunting shotguns and bamboo spears. They were using thoroughly modern weapons including a lot heavier gear than a few assault rifles, that match the standard issue of Chinese forces (which are very similar to Soviet weapons). There is no reasonable explanation for how the weapons made their way to the Stettin area that doesn't include serious, high level, smuggling. There is also no really reasonable explanation for how men and women who should never have any practical knowledge of using militarily quality weapons simply by watching TV.
3. These supposed amateur untrained, poorly led rebels fought what amouned to a BRIGADE of combat veterans ( equipped with, drones, LAV, Helicopters, and access to real-time satellite intel to a standstill for FIVE DAYS
This wasn't some college kids tossing rocks. It was WAY beyond that.
It wasn't even the Muj in Afghanistan. Closer to Hezbollah without artillery and armor. How would that look to SACEUR? How would his report be seen by the A4 Command Council?
Who was behind it? I never said, not going to now. Does seem really unlikely that it was cooked up by a few Poli-sci Grad Students over some cheap booze and some weed.
The German Statelets are prevented for producing weapons and dual use tech. Full Stop. They are solid economies, yes they have to pay reparartions, guess what, their predecessors burned Europe to the ground. Even then the Reparations are far from onerous, by GDP they are actually lower than either the FRG and GDR spent on Defense during the Cold War. There is no conscription in the German Statelets, overall spending on police service are a fraction of OTL, Are the various German statelets utterly prohibited from forming a larger pan-Germanic state? Yep. The A4 looked at World History between 1870 and 1960 and decided that three times was enough, especially since it was more than likely that the next time would be an Extinction Level Event. Not sure exactly how far that goes into oppression or, especially, maltreatment, but it is very real.