I will take the findings of the CIA and FBI over Crowdstrike
Seems their findings were based upon what they got from Crowdstrike;
EXCERPT:
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The disclosure that CrowdStrike found no evidence that alleged Russian hackers exfiltrated any data from the DNC server raises a critical question: On what basis, then, did it accuse them of stealing the emails? Further, on what basis did Obama administration officials make far more forceful claims about Russian hacking?
The January 2017 Intelligence Community Assessment (ICA), which formally accused Russia of a sweeping influence campaign involving the theft of Democratic emails, claimed the Russian intelligence service "exfiltrated large volumes of data from the DNC." A July 2018 indictment claimed that GRU officers "stole thousands of emails from the work accounts of DNC employees."
According to everyone concerned, the cyber-firm played a critical role in the FBI's investigation of the DNC data theft. Henry told the panel that CrowdStrike "shared intelligence with the FBI" on a regular basis, making "contact with them over a hundred times in the course of many months." In congressional testimony that same year, former FBI Director James Comey acknowledged that the FBI "never got direct access to the machines themselves," and instead relied on CrowdStrike, which "shared with us their forensics from their review of the system." According to Comey, the FBI would have preferred direct access to the server, and made "multiple requests at different levels," to obtain it. But after being rebuffed, "ultimately it was agreed to… [CrowdStrike] would share with us what they saw."
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CrowdStrike, the private cyber-security firm that first accused Russia of hacking Democratic Party emails and served as a critical source for U.S. intelligence officials in the years-long Trump-Russia
www.realclearinvestigations.com
BTW and FWIW, the link provided was from Real Clear Investigations, which was citing CrowdStrike.