The company has previously dismissed Wynn-Williams' claims as "out-of-date" and said that she was fired for "poor performance and toxic behavior."
Meta spokesperson Andy Stone shared the emergency arbitrator's ruling in a post on Threads, saying that it "affirms that Sarah Wynn Williams' false and defamatory book should never have been published."
"This urgent legal action was made necessary by Williams, who more than eight years after being terminated by the company, deliberately concealed the existence of her book project and avoided the industry's standard fact-checking process in order to rush it to shelves after waiting for eight years," Stone said.