Can a Filipino with Australian citizenship be able to stay in the Philippines indefinetely?

Yes, a Filipino with Australian citizenship can stay in the Philippines indefinitely. As a former Filipino citizen, they are eligible to apply for Dual Citizenship under the Republic Act No. 9225, which allows them to retain their Philippine citizenship. Once they reacquire their Philippine citizenship, they can live in the country without any restrictions. However, they must comply with any legal requirements during the application process.