Yeah, even allowing for translation issues, it's kind of a rambling mess.
Churchill was one of the few who took it seriously, and attempted to warn the allies about the Holocaust well before it became common knowledge. He was effectively shouted down by influential members of parliament, and ignored by much of the rest of the world.
The weird part is that even Jews in the US downplayed the warning from Churchill and others (including refugees); considering the idea so ludicrously heinous that no reasonable human could possibly have meant what Hitler and his cronies said, and wrote it off as counter-productively exaggerated propaganda. One can see their point, the scale and scope of it was unprecedented in human history, but the intent was very clear in the Nazis' published writings and public speeches.
And in the context of this discussion, as has been pointed out by several posters, modern Nazi ideology is informed by and in favour of the Holocaust. The fact that it was indeed a genocidal ideology in the 1930s is merely icing on the cake.
There are other ideologies that are also inherently violent, but Communism need not be, to take the example that is sometimes used as a tu-quoque when complaining how harshly Nazis are treated compared to other political groups