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. In a short session, results can fall well above or below the average, including a loss.