Slovenia was once the austrian-hungarian crownland Krain, also the former Untersteiermark and parts of Küstenland until end of WW1 in 1919 > in english Carniola, because of this he stated "austrian-slovenian", nothing to do with "border-changing".
Carniola: http://en.wikipedia.org/wiki/Carniola
Duchy of Carniola: http://en.wikipedia.org/wiki/Duchy_of_Carniola
Slovenia: http://en.wikipedia.org/wiki/Slovenia

Austria-Hungary in german: http://www.laender-lexikon.com/kuk.jpg
Austria-Hungary in english: http://www.brainworker.ch/Oesterreich/Austria-hungary.png