Non-paywalled link: https://wapo.st/3Yl9nNK
The title sounds a bit misleading. So here's what the article is really about:
"The latest effort, to be detailed at the massive annual Def Con hacking conference in Las Vegas next week, seeks to provide a foundation for messaging, file sharing and even social networking apps without harvesting any data, all secured by the kind of end-to-end encryption that makes interception hard even for governments."