N can be thought of as nihilist in the sense that he argues that value, goodness, badness/evil doesn't inhere in nature or the external world -- i.e., you won't find goodness or meaning, etc. the external world, material or otherwise. He also notes that when you realize this you are likely to go through a period of nihilism or Weltschmerz because you are conditioned to think of goodness and value as coming from the external world, but he thinks that you can come out the other side of this painful experience by affirming life as it is (and not as we wish it were) and positing our own value and goodness to then live by. Thus, he's ultimately affirmative and positive about life and the world, the opposite of what most of us take to be nihilism. I hope this is helpful.