RTP is the game’s theoretical return over a very large number of plays; the...
https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/
RTP is the game’s theoretical return over a very large number of plays; the house edge is the casino’s expected share. A 96% RTP means a 4% house edge, not that you’ll get 96p back for every £1 during one session