I especially like his inclusion of Gypsy among the Aryan languages. He could not have know that Gypsies would be included in the Holocaust, but he would have known that the Germans (like the English) would have been more prejudiced against Gypsies than against Jews.
I’d heard of something like this awhile back in an old wiki article (since revised) referring to it as “a language game” replacing French-origin words with Germanic-origin words (for example, replacing “rock” with “stone”), but I hadn’t known that anyone had done anything substantial along those lines, like with Tolkien or “Anglish”—and I’m heartily glad find out someone has!