I think it's far more likely that Spiegel is misrepresenting the context of the study. The German military, in particular, has a reputation for making contingency plans for everything. It seems to me far more credible that the purpose of the study is rather "in the unlikely event that 'peak oil' is reached soon AND this leads to 'total collapse of the markets', the German Army should respond with actions A, B and C".
Discovering such a plan would then have no more significance than finding out, say, about a study of the defensive measures required if Germany is invaded by the Czech Republic.