Whether Nietzsche "salted the mines" or not, I don't think he would have approved of the Nazi misappropriation of his thinking. I think he would have actually regretted it. He clearly intended nihilism to be a positive ideology, not the province of angsty teenagers contemplating suicide, or of chest-thumping strong-men. But then again, Marx did not intend for his ideology to invariably turn into totalitarianism, either.

The problem with both nihilism and communism is that people take away from them what they want to / find easy to, and then turn it into something harmful and gnarly. Probably because both ideologies looked better to their originators in between their ears, then they actually were in practice.