Hmm, I think that’s at the very least debatable. If we had a liberal court I can see how they’d go for that. Right now? Not so sure.

No. Elon Musks tweets are not workplace conditions anymore than your choice of owning a cat or dog is workplace conditions.

You can dislike something and also not think it's illegal.

His tweets are official company communications. They are every bit as relevant to workplace conditions as would be owning a cat or dog inside your office.

They have said that official company communications can come from his Twitter account. They have not made the claim that all communications from his Twitter account constitute official company communications.

You, a stranger and not an employee of SpaceX or Tesla, come across Elon Musk on the street while walking to get a chili dog. He looks at you and goes "That is the most hideous shirt I have ever seen" and walks off.

Is that workplace conditions?

Also, oddly enough, "official company communications" is not workplace conditions. You do not have a legal right to discuss company communications!