The short answer: The digital toolkit is not designed for this use case, it's better suited for operations where you are dealing with known, active, users (e.g. a user has completed the auth flow). That is to say, the digital toolkit also does not support exporting all known past or present users.
That endpoint won’t reliably return data for deleted/inactive records.
You're likely better off exposing other options (not guaranteed to fit your use case, but worth looking into):