Elon musk is not interested in Bitcoin the only reason you see him talking about Bitcoin is because of his political career, I heard that him and Donald Trump are having issues and because of that he has gone ahead to form his own political party ahead of the next election and to fight Donald trump which he supported to become the president of the United States of America, he has saw that a lot of people in the Bitcoin community that are investing on Bitcoin gave Donald trump there vote and the reason why that happened is because Donald trump was always talking about Bitcoin in his election campaign so Elon musk wants to use that same strategy to win the heart of Bitcoin investors, but that won't happen because we have already seen there kind of person they only want to use us to achieve what they want.
However if Elon musk wants to become the highest Bitcoin holder he can become he has the money to buy as much Bitcoin as he wants his the richest man in the world, he has the money to do that but I'm very sure he won't because he really don't trust Bitcoin he may invest a lot of money so people will see and support his political ambition.