RTP is a long-run average, not a promise for one session. At 96% RTP, the house...

https://www.coast-bookmarks.win/rtp-is-a-game-s-long-run-return-96-rtp-means-a-4-house-edge-on-average-not

RTP is a long-run average, not a promise for one session. At 96% RTP, the house edge is 4%: about £4 per £100 wagered, on average. Volatility shapes the swings; over a short session, results can be far above or below that average.