Wikitravel's Japanese-language guide to New South Wales (Japanese hasn't yet migrated to Wikivoyage), appears to claim that a Japanese passport is required for Japanese citizens to visit the Japanese war cemetery in Cowra:
カウラ ( Cowra ) ー カウラ日本人墓地とカウラ日本庭園がある。日本人墓地に入るには、日本国パスポートの提示が必要。
Cowra - Cowra There are Japanese cemetery and Cowra Japanese garden. To enter the Japanese cemetery, presentation of the Japanese passport is necessary.
By contrast, Visit Cowra says about the Japanese war cemetery:
Accessible at all times and admission is free
and there's no mention of any restrictions on the Trip Advisor page.
Are non-Japanese allowed to visit the cemetery, and are there any ID requirements for visiting the place?