The narrative around the DNC hack claim was always sketchy; many people believe the DNC email data was downloaded onto a flash drive and leaked. In a court filing the scale of sketchy has increased exponentially.
Suspecting they could prove the Russian hacking claim was false, lawyers representing Roger Stone requested the full Crowdstrike report on the DNC hack. When the DOJ responded to the Stone motion they made a rather significant admission.
Not only did the FBI not review the DNC server, the FBI/DOJ never even saw the Crowdstrike report.