Interesting, but also a combination of never-true and no-longer-true. They wrote a blogpost in 2019 that covers the situation & fixes well: https://www.matrix.org/blog/2019/09/27/privacy-improvements-...
If we are bashing "agencies", let's have a look at those tiny little projects like, SeLinux for instance. Or any other from this site https://code.nsa.gov/
This is the piece I find interesting:
> We do not recommend Matrix because we find unacceptable that a software widely hyped as decentralized is released sending a scandalous collection of private data to their central servers, even if you run your own instance.