In my opinion, the names and URLs in a password manager are data, not metadata.

I personally typed or copy-pasted all the entries in my keepass vault, it's primary information associated with the passwords, highly personal, and that it's not the definition of metadata. The fact that a tool automates the gathering of some data (URLs) for the user doesn't automatically make it metadata.

Metadata would the character encoding, version, encryption, ids required to read the file, as well as added/modified dates (potentially sensitive metadata).