Who knows if he didn't already 
There have been rumors in the past that he could be part of Bitcoin for many years already.
Is it true? I didn't hear it at all. but I don't think Elon would do that. I think there are some more important and urgent projects that he has to work on (Tesla and SpaceX are already taking a lot of time), I think he also owns several companies like boring companies? I'm not really sure There have been rumors in the past that he could be part of Bitcoin for many years already.