According to that post it says
"We have a survival server (/spawn), a plotme (/plotme) a protected place for small creative builds where you have access to every block in the game, Skyblock (/island) You start out on an island in the sky, where you go from there is up to you!; and a Large creative world (/warp creative) where the only limit is the size of your imagination! I am open to adding new features including minigames as our population grows."
However in game the only one that works is /plotme and /island.
/survival does not work, and /spawn does not work.
All it says is "you dont have access to that command"
I even tried /help
Any help would be much appreciated.