Gentlemen,
what might escape those who do not understand German is the bad quality of the text. An inexcusable number of mistakes, combined with faulty contents, that is another side of this paper. As an example she reports about early Japanese swords:
'.....Diese Schwerter waren aus gehämmertem Stahl oder aus Eisen gegossen, aber es war auch nicht unüblich, sie aus Stein herzustellen...which can be translated as:...These swords were made from hammered steel or cast iron, but it was not unusual to produce them from stone.......
Not much more to add from my side.