When we observe how Elon Musk involves himself or his companies with cryptocurrency, we realize that he is the quiet type who doesn't talk much about his holdings. Just as we preach decentralization, we should learn to take the issue of privacy seriously. I see no reason why On-Chain would propose the disclosure of Musk's holdings to the public when Musk isn't under any form of investigation. Musk never asked for his holdings to be released to the public unless On-Chain wants to be in the news. This is clearly unlike Saylor and MicroStrategy that reveals every step taken in the Bitcoin community.
Surprisingly, I observed that the holdings aren't that massive. It seems Musk isn't the type to purchase Bitcoin in large quantities like saylor.