RTP is a long-run average; the house edge is the casino’s expected share: 96%...

https://zanessmartcolumn.brightsora.com/posts/what-does-risk-tolerance-look-like-in-a-casino-context

RTP is a long-run average; the house edge is the casino’s expected share: 96% RTP means a 4% house edge. Volatility affects how wins and losses arrive. In a short session, results can vary widely—you can lose despite a high RTP.