In the 18th and 19th century Poland did not exist as a autonomous country, due to wars issues. Its land was divided into three parts, one joined to Russia, one to Austria and one to Germany.
"Austria, Poland" refers to that part of Poland, sometimes called "Galicja/Galizia", which was joined to Austria for 120 years at the moment the document was issued. It is the southern part of present Poland.
Hope that helps.