Aren't Netflix American? Can't see them being overly bothered as any legal action would need to be taken there.
Defamation law in the United States is not something which I have ever given a lot of consideration. It does seem quite clear though. Defaming someone using false information to do so would appear to be a big NO! NO! I'm sure the Pageretes of this life have their own version of Carter Ruck willing to drop Netflix a line.
FREE SPEECH V. DEFAMATIONIn the United States, federal defamation law is closely tied to the First Amendment. As a result, federal slander and libel laws are more defendant-friendly in the U.S. than those in common law countries, like the U.K. and Canada. In short, opinion is not considered defamation in the U.S. That being said, false statements of fact that harm the reputation of an individual or business, aren't protected under Constitutional Free Speech provisions.
http://kellywarnerlaw.com/us-defamation-laws/