Why would SpaceX be any different? If anything it would be even more disconnected from the fundamentals than Tesla is, given how much more control it gives Elon.
SpaceX stock is a bet on Elon, full stop. It has nothing to do with space, data centers, AI, or whatever technology they're currently working on; it's a bet that Elon will figure something out.
(and if you need any example of this, just look at Twitter--he engineered an exit for his X shareholders at a higher valuation [at the expense of SpaceX, but a positive exit nonetheless])