Thrawn does think Chiss are superior over all creatures. His culture indoctrinated it into him. His beliefs are fascist and supremacist. However, curiosity has gotten the best of him and that is why he is willing to learn from Emperor Palpatine’s Galactic Empire.
Thrawn is Uncle Rudi who is a German former Nazi turned spy for other entities outside of Russia and the United States in the cold war movie, The Man from UNCLE.
It’s always the one hated thing with great arrogance that will become persistent in one’s life. How interesting Karma works no matter what the Force using organization believes.