You left off a key word when you took the term "ethnic superiority" out of context. I prefaced it with the word "some" to indicate that I was considering only a single dimension, intelligence. I said nothing about "value of being a human being," so don't put words in my mouth.
The only value judgement I was making is that higher intelligence is superior to lower intelligence and that Nobel prizes is an extremely poor proxy for intelligence.
While there isn't a bullet-proof case, there is quite a bit of evidence for an ethnicity-intelligence correlation.