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

https://www.start-bookmarks.win/rtp-estimates-the-share-of-stakes-returned-over-many-plays-a-96-rtp-means-a

RTP is a long-run average, not a promise for one session: 96% RTP means a 4% house edge over time. Volatility affects how often wins come and how large they are. You can lose quickly even on a high-RTP game; short-term results vary widely.