Couldn't find any further info in English. German Police said they were looking for someone else and won't disclose more information: https://twitter.com/PolizeiMFR/status/1329685255427592192

It's hard to tell whether it's true or false, but regardless this was not a good example about German freeish speech, my bad.

Maybe a better one is this article about police raids: https://www.nytimes.com/2017/06/20/world/europe/germany-36-accused-of-hateful-postings-over-social-media.html

Or the hate speech articles related to Germany from Deutsche Welle: https://www.dw.com/en/hate-speech/t-38698844