RTP and house edge describe the long-run maths, not what you’ll get back in one...

https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/

RTP and house edge describe the long-run maths, not what you’ll get back in one session: a game with 96% RTP has a 4% house edge on average over many plays