Always trust the dev page of MC mods and plugins, it's run by the people who make the mod, not people who keep track of it.
Except for when they don't update it, or it was abandoned and the bukkit staff responsible for maintaining that site have not gotten around to marking a project as inactive, etc.
If they do not update it, then it isn't updated.
If it was abandoned, it isn't updated.
If it is inactive, is isn't updated.
If there is actually a download for the new MC version, it's updated.
There's no real leeway on this one, it either is updated and is available, or it isn't. It's up to the people who are in charge of the mod to make that difference, not bukkit's people. Sometimes the outdated version works, but that's your own risk.