The point of the silliness, as I understood it, was that these were desperate times in West Germany. Ronald Reagan and Margaret Thatcher were ramping up the Cold War rhetoric and there was much discussion of battlefield nuclear weapons. Germany was the battlefield. There was a real sense of fear in the air, a conviction that conflict was becoming more, not less, likely. And one response was to laugh at it all, to see the whole thing as being absurd. Again the note of Dada was not far distant. This is very definitely intended as art-rock.
Der Plan's debut album, the very excellent Geri Regi, was released in 1980. This track, 'Wir Werden Immer Mehr', is from the following year. There's a short introduction but the music starts twenty seconds in: