An interesting thing to do is to read and analyze posts & threads in terms of writing style, semantics, & syntax.
Often one finds very quickly that most or all of the posts & replies are done by the same person.
Case in point: On the link supplied, the post from one supposed German frauhlein is composed of 100% American English.
I have corresponded with numerous Germans as well as other foreign nationals over the years, and I can assure that the very best of them compose and speak English in a very "stilted" text-book style; the average one does a fairly good job but one must literally use common sense and "read between the lines" to understand what they are saying.
That site is so phony...it just reeks of classic modern propagandistic website composition: Starts off semi-Nazi, then posts a few semi-refutations (which "sort of agree but not quite"), then another post which agrees with the other, and then more start piling on leading the follower of the threads into milder and milder refutations while adding in more and more "facts and figures" to prove the original Nazi posts to be the most correct.
Lastly, it is my firm belief that it is impossible to "refute" the illogical insanities of Nazis. If one uses actual "logic" in the attempt, they declare that it is merely "Jew-logic". Use facts and testimonials, and they declare that "all were invented for use as propaganda by Jews".
Quote from textbooks & academic research, & they could care less because they have never read anything of worth and never will.
Torah commands us to "Destroy Amalek in every generation". Nowhere does it say we are to attempt to win them over.