Not so unusual as, perhaps, not something that comes up all that often?
I had the same situation arise. Both page and comment have been deleted (to keep it from being visible any longer) so I can’t link. Right now my solution is to turn off comments to prevent the page from becoming known about at all, forcing the legit users to email each other, but this is a bit clumsy. Would like a better solution.
The problem is that as soon as people know the url to the site the may not be able to access it -as they don’t know the password- but they would still be able to see all the comments underneath that TYPE PASSWORD IN field.