RTP estimates long-run returns; the house edge is the casino’s expected share....

https://charlottessuperjournals.tearosediner.net/why-no-system-works-isn-t-moralizing-it-s-just-math

RTP estimates long-run returns; the house edge is the casino’s expected share. At 96% RTP, it is 4%. Volatility shapes how wins and losses arrive. In a short session, results can swing far from the average; RTP won’t predict your outcome.