It's funny because few things make me seethe like someone talking to me in this way during a high stress moment. The artifice is transparent and if the conversation is tense the tone is quite easy to read as condescension. I'm hardly dismissing NVC as a tactic, just that when done poorly it's worse than simply being direct.
Perhaps I'm missing something, because I'm not familiar with NVC. After reading the article, it seems that having empathy and curiosity are necessary for NVC to work, and if someone doesn't approach it that way, then they aren't really engaging in NVC.
In these comments, there seems to be many people who dislike it, and I'm wondering why. If someone in a powerful position, like my boss, sought me out to discuss something and expressed empathy and wanted to find out why I did something the way I did, I would feel impressed and appreciated.