Elon is a manipulator who couldn't care less about you, me, crypto, or Twitter. He is aware that he has a big following amongst the crypto community and uses that position to create hype for the coins he owns and previously acquired.

He has already been charged by the SEC for fraud, and although he didn't admit doing anything wrong, he paid a $20 million penalty fee and was forced to step down as the CEO of Tesla. He tweeted and lied to his followers about his intentions of taking Tesla shares private for a much higher price than what they were worth. He lied that everything is ready for the listing, only the Tesla shareholders would have to vote and approve the idea. That was obviously all an act that resulted in the value of the shares to increase.

You can read all about it here if you want:
https://www.sec.gov/news/press-release/2018-226