Tesla stock has been massively over-valued for years - it's been clear that a company selling less cars than most other name-brand auto manufacturers shouldn't be one of the top ten most valuable companies in the world, but had a valuation that was propped up by Musk's massive fame and visibility.
(Of course shorting Tesla was always a risk, because "the market can remain irrational longer than you can remain solvent".)
As Musk, the worst thing you can do in that position is to wildly pivot into right wing politics and piss off a huge chunk of the world's population who can both afford your cars and care about climate change.
Right wing fans who can afford $100,000+ for a Cybertruck aren't going to make up that gap.