A shell game

I saw a headline "Elon Musk sells [the platform formerly known as twitter]"

The subhead is that it's for a lot of money and something about it being a valuable property and he profited from it!

Except that it's just some made up nonsense to generate a headline when no one checks any facts. 

He personally owned the platform. He "sold it" to another company that he owns, and rolled it under that company. 

That's an accounting trick of sorts, that allows for obfuscation of profits, losses, tax liability and such. 

It was a "stock swap" so that no actual cash changed hands. Another accounting trick!

The valuation was whatever he said it was since he owns both companies. 

And in the end, he still owns the social media platform, and can do whatever with it. But he'll tell you otherwise. Because him putting some distance between his name and any company he's involved with is better for his bottom line.