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

https://www.play-bookmarks.win/rtp-and-house-edge-describe-the-game-s-long-run-maths-a-96-rtp-means-a-4

RTP is a long-run average, not a session promise: at 96% RTP, the house edge is 4%, or about £4 per £100 wagered over time. Volatility shapes how wins and losses arrive. In a short session, results can swing sharply either way.