Thank you for thinking about accessibility. I am unable to see white text on a black background for more than half a minute, or end up seeing just a blur.
I’m photosensitive and also contrast sensitive, so going from dark mode to light mode can trigger migraines in me, on top of astigmatism making reading on dark mode more difficult in general. Elon Musk, along with sadly a lot of folks, can’t see beyond his own experience.