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

https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/

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.