Is it still adequate to mark this area as "landuse=military" if the barracks where closed over a decade ago? It seems as if the area was sold to a private person in 2008, as well. (source: https://www.sachsenschiene.net/bunker/dep/dep_14.htm)
I don't know if the area is still fenced off, since I've never been on site. Furthermore I don't feel familiar with the OSM land use tagging convention to try to fix this on my own.