It means that he is very distinguished, and that he is also very disturbing, or upsetting.

This is a man who is very well known and probably powerful, but he is also strange or a little bit crazy as well. Reminds me of Christian Bale in the movie American Psycho!

Huxley's view of the future was disturbing. Because of his literary achievements, he was distinguished. If he were a person of no achievement or education, his view of the future might be more easily ignored. So there is a connection between his distinction and our being disturbed. If he were undistinguished, we might have less reason to be disturbed.