Before the first spin, nothing is decided
Choosing a bet size and a session length is your decision, but how often the bonus round arrives is not known in advance. Nothing in the 6x5 grid tells you when the next Scatter symbols will land. The RTP describes the return over a very large number of spins, so the result of one session is random whatever the RTP is.
Checking the RTP version before you play is your call, and the version running here is shown only in the game rules. The three versions in the table differ by a few hundredths of a percent, so the choice changes the long-run return only slightly.
Planning your bankroll around the maximum win is a mistake, because the ceiling of Face Off is reached very rarely and cannot be predicted for any session. The maximum win is a ceiling, not a target, and the figures in the table show what it means in money at each bet.