RTP is a long-run average; the house edge is the casino’s expected share: 96%...
https://wiki-planet.win/index.php/Variance_vs_Volatility_in_Slots:_Are_They_the_Same_Thing%3F
RTP is a long-run average; the house edge is the casino’s expected share: 96% RTP = 4% house edge. Volatility describes how uneven wins can be. In a short session, results may differ sharply from the average, including losing streaks.