The stock is priced on expectations of how many humanoid robots they might sell over the next decade.
Those expectations in turn treat humanoid robotics as if Tesla is the only game in town, when Tesla's Optimus is not yet available for purchase and other companies already ship.
ChatGPT, for all its flaws, does actually exist and definitely isn't just a remote-control-based illusion, and some people even pay for it.
Optimus, the only thing we can be sure is real is the hardware, which is the least interesting part. But even if they really are running just on software without remote control, the one and only thing they've shown in any public demo that would actually be impressive, was voice comprehension in a noisy environment.