The phrase "nominally a Swiss" also struck me. At first I thought Kipling was saying that Einstein's Jewish identity was primary over his Swiss one, but the end of the passage it's clear that he's talking about him as a German. Why, though, since he's not a German national and racially K sees him as Jewish? Presumably it's not just a question of his being German-speaking, or K would have to admit all kinds of undesirables as English on the same principle.

I mean, I know racism doesn't have to be logical, but I don't even know what Kipling thinks he's saying here.