The fact that Nova Scotia might have violated a separate obligation to secure sensitive information doesn't make accessing that information not trespass.
This is like going to a library, asking the librarian if you can check out a book, being told yes, and then later being arrested because they meant to say "no".
I think the real question here is: did the website provide enough information for the user to have been assumed to understand that what they were accessing wasn’t meant to be public (e.g. did the door look like a door to a private property)? And did the user cease to access the data once they understood it (e.g. did they close the door and leave)?