If you read [the ruling](https://storage.courtlistener.com/recap/gov.uscourts.ca5.214640/gov.uscourts.ca5.214640.238.1.pdf) the court found that the government interfered with social media companies process of content moderation and did so through coercive application of government authority. The government identified specific posts and accounts it wanted removed and did so while threatening regulatory penalties that would be imposed if the social media companies did not comply.
The court (using a four factor test established by both the 2nd and 9th circuits) found that this went beyond a request and became government interference in free speech.