1. Tell someone you own a security 2. They get excited and buy it 3. You sell it when it goes up

You can't just classify this set of actions as a pump and dump. You have to do something that is considered a scam, such as grossly misrepresenting the security with the intention of making a profit at the cost of uneducated investors. As far as I can tell, Elon never claimed Bitcoin is environmentally friendly, nor did he make other false claims about Bitcoin's functionalities or capabilities.