You can see the complete history of the document in DocuShare. I think it’s safe to assume that the version marked “preferred” there will always be the latest approved version; that’s a better guide than relying on the URL shortener.
That said, I’ve created IT-291 to request that the link be updated.
Correct. We had the exact same debate on the ticket. The file name at the end is just indicating what the retrieved version should be named and not the name of a specific remote resource.