Just be careful not to accidently leak your passwords or 12-word crypto keys . It's like a hot mic but worse. If such technology becomes more commonplace, and not just for paralyzed people, this will be a problem.
The article doesn't specify how it works, but my guess is that you're controlling some typing or word selection in a learned way, like eg how Stephen Hawking talked but with some eeg input instead of muscle movement. You're not broadcasting your thoughts.
It only registers a binary input (e.g. mouse-click); their YouTube[0] shows a patient using it in conjunction with eye-tracking.
[0]: https://www.youtube.com/watch?v=mm95r05hui0