Original: In contrast to many other dialects of German, Austro-Bavarian differs sufficiently from Standard German to make it difficult for native Austro-Bavarian speakers to adopt standard pronunciation.
Simplified: Like standard German, Austro-Bavarian is a High German language, but they are not the same language. However, Austro-Bavarian and Standard German have influenced each other and the vast majority of Austro-Bavarian speakers speak Standard German as well.