All game provider information sent to casinos is sent like this. Its very uncommon for it to be shown to the player like this.
The base game RTP on some slots is incredibly low, think Vikings by netent, but Bonanza is very very high with volatility due to difficulty of landing the bonus making up for lower bonus RTP.
Some slots have 4 of 5 features, think Blueprint games, each of those small bonuses and wheels like on Goonies will all be calculated to affect RTP.
