Clear expectations before any bet is placed
Scatter symbols land on the 7x7 grid and can open the Free Spins round, but nothing on screen shows when the next one will come. How often the bonus round comes is not known in advance. The RTP of 96.55% is an average over a very large number of spins, so the result of one session is random whatever the RTP.
Every spin on the 7x7 grid, from base game to Super Free Spins, is set to the same RTP. Only one version is listed for this slot, and the game rules are where you confirm which version is running before you play.
A Tumble chain keeps cascading on the reels until no new win lands, and the top prize is x10,000 the bet. At the A$5 example bet that is A$50,000, and at the A$240 maximum bet the ceiling reaches A$2,400,000. That ceiling is reached very rarely, so it is a limit on the payout, not a target.