Which of the two versions is in play?
96.30% is the base RTP, and it describes the return over a very long run, not one session. How often the Free Games Feature comes is not known in advance, and this page does not estimate it. The result of one session is random, whatever the RTP.
96.30% and 96.38% are the two RTP versions of Fire Hopper. The rules of the game are the only place that shows which one is in use, so check there before the first spin. A higher RTP means more returned over a long run, but it does not change how any single round turns out.
x50,000 the bet is the highest win the game pays, and it is a ceiling reached very rarely. At the highest bet of A$100 that comes to A$5,000,000. At the example top bet of A$10 it comes to A$500,000. Reaching it is a matter of luck, and no spin plan changes that.