Since they categorically refused to allow FBI investigators to access their computers or mail servers, they have no evidence that the Russians interfered. And if they had allowed the FBI to investigate, they would have found that it was an inside job.
Discovery in this suit will be fun.
Right now there’s only one source that’s carefully examined the “Russian hack” theory, the Nation” magazine and it’s concluded there was no hack, but an inside leak. See:
https://www.thenation.com/article/a-new-report-raises-big-questions-about-last-years-dnc-hack/
Discovery should be fun, especially since the DNC refused to allow the FBI to examine their “hacked” computers.