They ARE in the game code. So either they're used or they will be added or the developer simply copied the whole code of Slime Rancher 1 without deleting unused stuff.
Its either the second or third option. They arent in the game YET. There are no Slime Key Doors in the EA right now. Just the 'shoot correct plort into corresponding statues' ones. And Rad Slimes arent one of the slimes you can get yet. They will be added eventually, as like you said, their in the game data and such. But they dont have a way to be obtained yet. Ah well. I was just curious as to why those were options, and you answered my question. So thanks.
Anything on the code in the file I shared a few days ago?
Issue has been fixed already, few days ago.