Does the RTP predict your next session?
5x3 grid, 10 paylines and 96.06 RTP describe Big Bass Halloween on paper, but they do not say when the bonus round will come. How often the Free Spins trigger is not known in advance, and the result of one session is random whatever the RTP.
A$100 staked is the basis of the RTP table on this page. The RTP version running here is shown only in the game rules, not on the lobby tile. Open the rules inside the game before your first spin to check the version in use.
x2,100 of the bet is the top payout Big Bass Halloween can pay, which is A$787,500 at the A$375 max bet. That figure is a ceiling, and players reach it very rarely. Treat it as the limit of the paytable, not as a target for any session.