Could also be translated as: ...Australia is dry.?
Well, yes, in the sense that the "lands rose up and were separated from the waters", so they're dry. That's where the word for continent comes from, in both Hebrew and English. If you're incontinent, you're wet ;-)
The recorded audio is missing the word היא.
It's because אוסטרליה ends with ה and יבשת begins with י together these two letters are spoken the same as היא.
Have to agree and must agree mean the same thing in English!