That's correct.
First of all, metadata is quite broad, so there might be a need to make sure that we understand what exactly we are referring to when we say metadata. It's information captured by an electronic service provider insofar as every little bit of that information can be considered metadata.
Ultimately, the role of the police is not just to identify an Internet subscriber. An Internet subscriber is just the person who pays for the Internet connection. Our job, in order to satisfy prosecution, is to identify the person behind the keyboard. In order to do so, we need to dig into the content of what's happening on the Internet to identify the actual suspect user as opposed to simply a subscriber. The subscriber is a piece of the puzzle, and it leads our investigation into, hopefully, the user. We can't identify a user if we can't see their traces or identify them through some of their traces on the Internet, if that makes sense.