This isn't the first time a person or company has been tripped up in a civil case by the facts contained in an SEC filing. And, what are they going to say? Either they can admit they lied in the civil case, or they lied in the SEC filing. And considering the penalties for knowing lying in an SEC filing can be quite severe, I think we know which one most people will choose.
It also further demonstrates that SEC filings are vitally important for DD, and should be reviewed by everyone with an interest or potential interest in that company. Even for civil lawsuits.