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

https://andysbestchat.lucialpiazzale.com/why-do-i-lose-fast-on-a-high-rtp-slot

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