Granted, it sounds like it's out of a bad 50s sitcom, but that is what the article says.
I agree with your skepticism, given the tendency of the "Muslim community" to cry wolf.
Assuming wolf is halal.
Given that there are many legal and effective bastard-beaters available, carrying brass knuckles strikes me as being a bit unlikely. I acknowledge that there is jewelry that could have a similar effect, not the least including those big "bowl" rings frequently worn by...OK, football players.
Assuming wolf is halal.
Dunno. I'm sure it's not kosher, though. (Doesn't have a cloven hoof or chew the cud.)
P.S. The fact that the university has asked both the "perps" and "victims" to move off campus suggests that there's more to the story than went into the article.