It says he had a cameo role and is in the credits as appearing in the film.
I love this about the maker of the film.
Who is Rupert Kathner?
Rupert Kathner was an Australian film director best known for newsreels and low-budget films. He worked with Alma Brooks, an ex-barmaid, who co-produced, operated the camera, edited, co-scripted and acted in their films. Kathner and Brooks were also "shady con artists and fugitives from the law", sometimes described as the "Bonnie and Clyde" of the Australian film industry.
born in 1904 (111 years ago) in Adelaide
profession: Film director, screenwriter, film producer, cinematographer, actor
died in 1954 (61 years ago)