Unpredictable bonus timing and session totals
The 96.51% RTP describes the return over a large number of rounds, and it says nothing about how often Free Spins arrive in one session. The bonus round can come on the first spin or after a long wait, and nobody can know that in advance. One session's result is random whatever the RTP, so it can end well above or well below the amount staked.
Only one RTP version, 96.51%, is listed for Big Bass Reel Repeat. Which RTP version runs on a given game is shown only in the game rules, so read them before your first spin. Those rules give the version that applies to every session you play.
A$25,000 is the top win at the A$5 example bet, which equals the x5,000 maximum win. The ceiling is reached very rarely, and a Free Spins round ends at once when total win reaches it. Size your bet to your budget, not to the top figure on this page.