Some folk have elephants in the room, why not a tank in the basement?
I know accuracy is anathema to the subs round here, but the suburb where the villa housing the tank is located is Heikendorf, not, as you have written it, Keikendorf.
The presence of the torpedo is entirely predictable, Heikendorf is the site of the memorial to the U-Boat war dead .Rather chilling, worth checking out - https://de.wikipedia.org/wiki/U-Boot-Ehrenmal_M%C3%B6ltenort#/media/File:U-Boot-Ehrenmal_M%C3%B6ltenort_2.jpg
Most Germans love mechanical objects, old tanks are commonplace and torpedos are always popular exhibits in museums, I wonder if this bloke has a Messerschmitt Me 262, as well, that would be something! I always thought Goldfinger was quite Germanic