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

https://www.bookmarkingqueen.win/rtp-is-the-long-run-share-a-game-is-designed-to-return-the-house-edge-is-the

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility affects how uneven results can be. In a short session, swings can leave you well ahead of or behind that average.