Earlier quoted context omitted.
Not exclusively. It has elements from Hebrew and Aramaic (of course) as well as from various Slavic languages. A big chunk of it derives from High German but not all.
What tokai said was OK: English is also classified as a Germanic language even though it includes a lot of French words, not to mention Hindi etc. For that matter, a German word like „Dolmetsch“ doesn’t make German a Turkic language.
I completely agree with your point about a "Germanic language" but I disagree about "a German language".