As a swede who wanted to look up more about these Swedish researchers, it was hilarious to me that they were actually Swiss. Then I looked up the article's author and apparently she's German. Seriously thought only North America got Sweden and Switzerland mixed up.
This would be revolutionary and I'm not just talking about headphones, think about situations like having a snoring partner or a construction site nearby. I can imagine how a business like "earplugs with ionised noise cancellation" emerges and becomes very successful.