NAKWON: LAST PARADISE Playtest is impossible, ARC Raiders Playtest is possible. Why is that, even though both are multiplayer games?
Welcome to the community. 
Nowhere does it say that Wand has a trainer available for the online game, Arc Raiders, whether for the playtest or the full game.
If you see a “Request” button on a game that is online only, it can be pressed as many times as you like and there will still never be a trainer for it. Perhaps the button will be disabled in the future.
As for the full game, only a map is available. No trainers or cheats.