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

https://lorenzosnewblogs.nexorafield.com/posts/what-does-risk-adjusted-return-even-mean-for-gambling

RTP is a long-run average, not a session promise: 96% RTP = 4% house edge, or £96 returned per £100 wagered over time. Volatility shapes swings; a short session can land far above or below that. Past results don’t predict your next spin.