I don't think so. You need to see the entire book - it's about warning British soldiers who are inside Germany not to trust any German, not to be taken in by them, and at the back, it gives German language phrases, geography, etc. It is meant to be helpful to British soldiers and to ensure that they don't give away British information. The very fact that it is repeated several times not to fraternize with Germans is indicative of the fact that they were not there to influence Germans with British culture.