It has always been my understanding, as someone who grew up in Europe as the
child of German born parents that Hoch Deutsch is the true German as spoken
by most Germans, as opposed to the Schwabisch dialect >from the South, or
Schweizer Deutsch of the Swiss or the Austrian dialects etc. It is not
entirely unlike the expression "The Queen's English" when referring to those
who speak the language without accent or dialect in the U.K.