To be clear, first amendment doesn't say the gov't shouldn't (let alone can't) ask you to do (or not do) something. It states that the legislative body of the federal government cannot make a law abridging the freedom of speech.
I would not be surprised to find out sometime that there are judges who might disagree with you on that point.
The 1st amendment prohibits the government from interfering with speech. You just admitted he was not part of the government. Therefore it’s not a 1st amendment violation.
It may be morally wrong, or violating “free speech”, but I don’t see a 1st amendment violation.
I'm not going to claim that it isn't an issue that VIPs have excessive influence on social media companies and there operations. People with lots of followers have certainly been able to pull strings to craft the message at twitter in the past. Joe Biden and his campaign team c. Oct 2020 are certainly to be counted in that number. Things like banning certain accounts ( https://www.wired.co.uk/article/elon-musk-parody-twitter-acc... ) or getting your account unblocked ( https://www.bbc.com/news/technology-45953747 ).
I am going to ask specifically how this is a first amendment issue when none of the people involved had any role within the government at the time this took place.
Can you clarify what you mean by this? Are you talking about the tweets with nudity they emailed about?