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

https://www.random-bookmarks.win/rtp-is-a-long-run-average-not-a-session-promise-96-rtp-means-a-4-house-edge

RTP is a long-run average, not a promise for one session: 96% RTP means a 4% house edge over time. Volatility describes how uneven results can be. Short-run variance can leave you well ahead or down, even when the game’s average is clear.