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

https://shed-wiki.win/index.php/Why_Do_High_Variance_Games_Have_Long_Dead_Spells%3F

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility describes how uneven results can be. In a short session, you can finish well above or below the average.