RTP is the share a game is designed to return over many plays: 96% RTP means a...

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

RTP is the share a game is designed to return over many plays: 96% RTP means a 4% house edge. Volatility affects how wins and losses arrive. In a short session, results can differ sharply from the long-run average.