Premise: I strongly disagree with historical matchmaking or similar ideas and I think the BR system is great. But this particular claim is not correct. The first test drive of the Maus was on 28th December 1943 at Alkett’s proving grounds. In the summer of 1944 Hitler cancelled all work on all super heavy tanks, although work on the Maus and its competitors continued clandestinely after that order, in limited fashion. All development work for the Maus took place completely before 8th May 1945, making the Maus definitionally a WW2 vehicle.
The arguable only thing that took place after the German surrender was assembly, done by the Soviets, where they mated a hull with a V1 turret (so in any case all wartime pieces, in fact the V1 is called like that because it was not meant for the production run). However WW2 did not end with Germany’s surrender, it ended with Japan’s surrender, and even more importantly, the Cold War did not begin the exact day after the end of hostilities. The Maus reached Kubinka well before the start of the Cold War.
