“Flynn was adamant the Russians did not carry out the hack. To support this theory Flynn advised, based on his experience, the United States Intelligence Community (USIC) was not capable of figuring it out.” – from the 302’s of the Mueller/DOJ interview with cooperating Richard Gates, p.17, declassified on Nov 1, 2019.
Throughout the interview, the emails leaked from the Clinton’s illegal basement server were conflated with the emails leaked from the DNC and/or Podesta.