Known RTP before the spin, unknown result after
Each spin on the 7x7 grid lands its symbols at random, so a Free Spins trigger can stay away for a long time. Nobody can know in advance how often the bonus round comes. The result of one session is random too. A short session and a long one both happen at the 96.50 percent RTP, because RTP describes the return over a very large number of bets.
The reels pay out under one RTP version, and that version is shown only in the game rules. Sugar Rush Xmas is one version of the series, and the other versions carry their own RTP figures, so read the rules screen for the version you are playing before the first spin.
Wins build on the reels through tumbles and Multiplier Spots, but Sugar Rush Xmas stops at a maximum win of x5,000 of the bet. At the A$10 example bet that ceiling is A$50,000, and it is reached very rarely.