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

https://charlottessuperjournals.tearosediner.net/how-do-i-read-a-slot-s-rtp-and-not-overthink-it

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.