Big Bass – Hold & Spinner: no sure return
96.07 and 96.09 are the two RTP versions of this slot. An RTP describes the average return over a very long run of spins, so it says nothing about the next spin. How often the bonus round comes is not known in advance. The result of one session is random, whatever the RTP is.
96.07 or 96.09 is the RTP this game runs, and only the game rules say which one. Check the rules before you stake, since the version sets the return on every bet you place. Keep that in mind when you compare the two versions.
x10,000 is the largest win this game can pay, measured against the bet, and it is reached very rarely. Nothing on this page says when, or whether, a session will get there. The game is high volatility, so wins come unevenly, and a long dry spell says nothing about the next spin.