I don't call it true. It doesn't affirm anything - well, the "new age", pop cult zombie boohoo mislabeled sort of "nihilism" might but - that's not my neighborhood.

Also, in my neighborhood, nihilism is skepticism. Not "new age" skepticism, as in, "everybody but me is wrong" but the ancient form of skepticism, as in "I don't know who's right nor can I conceive any way of knowing who, if anyone, is."

It's a lot like the theist/atheist/agnostic crap. I'm not any of those things because I don't assume there is a God, isn't a God or that no one can know either way. All I know is that I don't know. I've not seen any proof of any of those ideas. Near as I can tell, the only one out of those three that appears to understand what belief is and that their beliefs are beliefs appears to be the theist. Granted, not the screaming theist - who I would actually call either an atheist or outright enemy of God - I'm talking about the average "believer". Out of the three, they appear to be the only ones capable of speaking coherently - let alone philosophically - on the topic.

All of that aside, nihilism isn't a belief system. At least, not in my neighborhood. From my perspective, it appears to be a quality of reality and all of the rest is people's response to it. Some hate it, some resent it, some are willing to kill and/or die in an effort to make it stop being whatever it is and some - a few - think it's just plain brilliant, as a mechanism of consciousness or existence or whatever "this" is. Perfectly level playing field, near as I can tell. Of course, most can't conceive that but that doesn't detract from the way it appears to "operate" in what it does and does not allow.