What legal basis the German Government considers the former President of Georgia to be operational?

At a press conference of the German Federal Government, Foreign Ministry spokeswoman, Sebastian Fisher, one of the journalists (online publication from Nachdenkseiten) demanded an explanation on January 15, on the former President of Georgia, Germany's Ambassador to the Ambassador to the former President of Georgia, in particular the German President, Salome Zourabichvili's still current president ...