They’re working through this now. I think the public claims of ‘it’s classified’ and “has to do with nuclear sub etc info” were to try to paint a picture that it was pretty much without question national security related. Whether that’s what the information truly is or not, isn’t publicly know, but it doesn’t necessarily require each jury member to make that determination by themselves alone, either. Some jurors may feel that they personally have to see it, butsome may not, and be willing to listen to the professional opinions of witnesses on its nature, only.
This is a U.S. criminal court case. The issue is not what jurors may or may not want to see/hear. The only issue that matters is the right of the defendants to see evidence in the case, call and cross-examine witnesses, and present facts in a court of law.