Oh woah, very important context about who @sachee is (I'm just a humble JavaScript guy, I didn't know she was such a big fish). And... Yeah, as other notes have pointed out, she has been fired already:
And don't get me wrong, she totally looked for it: if you post, publicly, that your boss can kiss you ass... Well, you know what you are up to. Same for the android guy they fired yesterday.
What's incredible is the Musk has managed to have so many engineers in open rebellion, almost looking to be fired. See, engineers are usually a quiet folk. As a group, we usually don't steer the pot too much: we are the folks who earn crazy amounts of money for a job we usually enjoy, so, sadly, we tend to put up with any kind in bullshit in silence. I have seen entire engineering organizations melt away several times, and there is always the kind of comments we are seeing on Twitter... in private. In DMs, or private channels, or small group watercooler conversations. But even if you are 100% sure you want out, you don't want to openly fight management: you want to find another job that's cozy and interesting before leaving, and even when you do, the tech world is kind of small, it's in your own interest to leave without leaving any beef behind, just in case you meet the same people again in the future.
The fact that so many engineers, high profile ones even, are dissing management at this level means that they not only want out, but they want out ASAP and they are expecting for the company to really meltdown so their own leave ends being just an anecdote in the overall Pompeii-like story of The End Of Twitter.
In any other week, someone like @sachee leaving Twitter like this would be the biggest and sauciest news of the development scene for weeks. Now? It will probably be forgotten by the end of the day, buried under who knows what.