Yes Ellias, it does work, just without the %'s in there so if your character is %100 unharmed and you did this in the room description:
!if character.unharmed! Hello
It would display Hello.
If you did this:
!if character.slightlywounded! Hello
It wont display unless you are slightly wounded. This should be updated in the rules page and news page as this is vital information. Thanks AT for the find and Ellias for more input. Also thanks to others as well.