Musk, just trying to promote his company my friends. He is only interesting with Tesla's future. And he is using all tolls for that including cryptocurrencies (especially BTC).
Don't expect something useful from him. It is not pretty possible. And don't forget, he already tweeted about Bitcoin few times but there were no affect on Bitcoin's price ever.
Musk has done a lot in the field of space exploration and, in particular, the exploration of Mars. Recently, he probably has done much more than all the states of the world. At the same time, he has repeatedly written that he is little interested in cryptocurrency. It would already be a lot for one person, so that he would also be Satoshi Nakamoto. People always tend to fantasize too much.