Known paytable before the first spin, unknown after
The 96.55% RTP is a long-run figure for A$100 staked, not a forecast for your next session. How often the Free Spins round comes is not known in advance, and the result of one session is random whatever the RTP. Two players on the same 7x7 grid can see very different sessions.
96.55% is the single RTP version listed for Fortune of Olympus on this page. Which RTP version runs in the lobby is shown only in the game rules, so read them before the first spin, not after.
x10,000 is the ceiling of Fortune of Olympus, the top multiple of the bet a single round can reach. The ceiling is reached very rarely, and no session can be planned around it. The table below shows what that ceiling means in money at each bet.