Evidently, this has nothing to do with the criminal case being pursued by the FBI.
Instead, it is related to the FOIA case brought by Judicial Watch. Most of what we in the public know about Hillary's e-mails and the server arrangement has come from the FOIA case.
You’re correct in saying that it has nothing to do with the FBI. However, since the FBI is conducting a parallel criminal investigation, the answers will be of interest to the FBI too who will soon schedule their own interviews.