Joe can do whatever he wants. He’s the President of the United States. We won’t be hearing this from mainstream media outlets. So if you are a reporter and you actually want to report on news, this is a good time to go solo. Big Tech might try to block you though so that would be a challenge.
He doesn't hold that official title legally. He's the Pretender-in-Thief, and that is the way only way I will refer to him for as long as he holds office. Calling him the President insinuates he got the position legally.