The little boy was very, very fair with white blond hair.
The professor has no social skills. Another thing we have all noticed about this guy is his inability to whisper. He talks in a loud voice no matter what the situation.
My son, who is normally blond and fair anyway, was anemic and exceptionally pale around the age of 9 months. It got picked up during some routine bloodwork that they do at that age. I had thought he looked pretty pale, but it was summertime and I was keeping him out of the sun, so I second-guessed myself and thought he looked lighter because the rest of us were darker.
I have knowm albinos. The trait is recessive and is in decline. One albino was, indeed, black by race but clearly negroid and had a twin without the abinoism. My wife is extremely light and has albino ancestry in a family appropriately named "White". If the professor were knowledgible he would have been able to determine race and the trait by more observation. As I noted above, the albino trait can exist across racial lines.