RTP is a long-run average, not a promise for one session: 96% RTP means a 4%...

https://www.random-bookmarks.win/rtp-is-the-share-of-stakes-a-game-is-designed-to-return-over-a-very-large

RTP is a long-run average, not a promise for one session: 96% RTP means a 4% house edge over time. Volatility describes how uneven results can be. In short sessions, results may differ sharply from the average—you may lose quickly or win unexpectedly.