However, he did found SpaceX 20 years ago in 2002. And their first successful launch was in 2008, 14 years ago.
It's entirely likely he puts less effort and impact into the daily running of SpaceX now, however I don't believe his last 6 months running Twitter invalidate his last 20 years running SpaceX.
Have to imagine investors in Tesla are not happy right now with such divisive activities from Elon Musk in the public sphere and the lack of focus on the company (yes I can say factually he is not focusing enough on Tesla).