The usurpation of "Austrian" is in the tradition of other Judaic usurpations of national identity to afford camouflage and deniability to the perpetrators: "Russian" mafia, "Wall Street" bankers, young "Turks," "Russian" Communists, "San Fernando Valley" pornographers, "Serbian" anarchists, "international" financiers, etc., etc., etc.
The тαℓмυd teaches them to hide their identity when they do evil. They are quite accomplished at that.