Tesla stock has been down before, but the thing is "everybody" knows it isn't a $580 billion company (or an $800 billion one a few months ago). Just floating on hype until it isn't anymore.
Musk's play for years has been to make up some bullshit (ROBOTAXIS!) to pump it up just a bit longer. The press still isn't as skeptical as they should be of whatever his latest nonsense is, but he's really just running out of fake ideas to peddle.