The interesting bit is that they explicitly point out part 7 of the TKG (telecommunications act) which details the telecommunication provider's duties in assisting law enforcement agencies, such as providing interfaces for targeted surveillance.

Relevant part of the law:

https://translate.googleusercontent.com/translate_c?depth=1&...

See especially paragraph 110 and following.

So I wonder if they want developers of XMPP software to implement surveillance features?