Information is definitely out-dated, and you shouldn't really take it to heart.
The Slot Machine is a completely scrapped feature for R2DA.
As it is a slot machine, it's generally assumed that prizes such as items would've been awarded after a successful spin.
- The image behind the name, "Super Win Win!", is King Crab doing his ground smash.
- For a brief period, the Slot Machine appeared on Debug, making it one of the few Debug-exclusive elements of the game.
- This video shows how the Slot Machine works.