https://cdn.netzpolitik.org/wp-upload/2019/04/2017-12-21_Vir...
There are two assumptions they use to infer the identity of NF:
1- The belief of two persons that the person who they were talking with was probably Assange.
2- That only one single person was using that jabber account.
The only thing I can personally infer from the information they presented is that NF was (very likely) a member of Wikileaks at that time.
What am I missing?