I think it's much more likely this story was spread by native English speakers who learned German as a second language in school. It has all the hallmarks of a teacher's pedantry to me.
That said, blunders do occasionally happen even at this level. During Bill Clinton's visit in Romania (the first time a US president visited the country after the Revolution), he said in a huge public speech that the American people stands shoulder to shoulder with the Romanians - which the translator for the public broadcast translated as "șold la șold", which sounds similar, but means "hip to hip" (the correct translation, which is also a literal translation as the expression exists in Romanian as well, is "umăr la umăr").
That said, blunders do occasionally happen even at this level. During Bill Clinton's visit in Romania (the first time a US president visited the country after the Revolution), he said in a huge public speech that the American people stands shoulder to shoulder with the Romanians - which the translator for the public broadcast translated as "șold la șold", which sounds similar, but means "hip to hip" (the correct translation, which is also a literal translation as the expression exists in Romanian as well, is "umăr la umăr").