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

https://www.joint-bookmarks.win/rtp-describes-the-game-s-long-run-average-return-96-rtp-means-a-4-house

RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one session. Volatility shapes how often wins land and how large they may be. Short-run results can swing sharply, so you can lose more than expected.