German deanon was done 2021, only reported now. And torproject not receive report from investigator, only CCC did.

So we not know how deanon.

I think you read the news about Germany unmasking somebody who was using an older version of a Tor app. This has been proven to be mostly a user error.

The attacks occurred on an old version of the long-retired application Ricochet that lacked new features The Tor Project has released since to mitigate against the kind of ‘timing’ analysis described in the articles. The most current versions of Ricochet-Refresh have such protections in place.

https://blog.torproject.org/tor-is-still-safe/