Military tribunals are public. Any classified info is "redacted" but the charge and outcome are not hidden.
https://www.ucmjdefense.com/military-court-martial-results.html
Even the GTMO stuff is somewhat public. Especially if a civilian is hailed into MilCt, the legal battle will be public. See Hamdan v. Rumsfeld case.
Yes, grand jury is secret for the most part. Sometimes (unusual, but hard to hide case/suspect combo - OJ Simpson for example) we know who they are investigating, but the deliberations are kept very well hidden.
Cubanadian Ted Cruz
And that Joint Analysis Report is getting endorsed by Barr, Graham, and other assorted DS plants. Crowdstrike's conclusions will not be questioned.