Is that image from the QF site?
Sales may be 85%, but doesnt look like it. Many people do not chose a seat allocation. They wait until check-in.
The front economy rows are "blocked" for passengers with status. They open to all at T-80 hours.
Exit rows can be booked for a $ fee (no matter what status). Unusual they are shows X.
In my experience the very last rows on B737 TT flights only get allocated if the flight is full or are unaccompanied children.
AA code share may complicate it.