Some of that additional income accrues to the foreign shareholders of companies but a good deal of it stays in Australia in the form of profits and dividends, taxes, wages and so on. There are then indirect effects as that income is partly spent on domestically-produced goods and services.
The Bank has also committed itself to continue the virtually zero percent interest rate level until it judges that price stability is in sight. That is considered to encourage longer-term interest rates to be low and stable.