The article is exaggerating the guy's setup way too much. Opsec doesn't end at the application level... The OS (the most popular being in bed with US), ISP, tor nodes, Honeypot VPNs, so on and so on could leave a trail.
Using telegram public groups and obfuscating a calculator as a password protection layer is hillbilly level of security.
And i'm glad these fuckos don't have the knowledge to go beyond App developers marketing.
Techcrunch has basically been an ad network for companies who want to promote themselves. Other open source projects probably don't have a budget to pay for an a̶r̶t̶i̶c̶l̶e̶ ad spot.