I disagree with the author. The censorship was egregious but the plaintiffs in this case had no cause of action against the U.S. government. THEY were not censored; FACEBOOK was ... which means Facebook has the legal standing to sue the government over a First Amendment violation, not ordinary citizens or state governments.
You couldn't be more wrong. I suggest you read Alito's dissent. You fundamentally misunderstand what this case was about.