RTP estimates a game's long-run return: 96% RTP means a 4% house edge....

https://www.bookmarkidea.win/rtp-and-house-edge-describe-the-long-run-maths-not-what-you-ll-get-back-in-one-1

RTP estimates a game's long-run return: 96% RTP means a 4% house edge. Volatility describes how uneven results may be. In a short session, you can win or lose far more than the average suggests; RTP is no guarantee of an outcome.