Earlier quoted context omitted.
This has elements of truth but is a conspiracy theory the way you describe it. If you listen to Musk, or listen to people who work for Musk, or the people who work for those people, they all say that the point of SpaceX is to enable human colonization of Mars. It's not just a marketing strategy to acquire talent (unless you think they're all lying -- hence the conspiracy aspect. Now, to do that, they'll need to scrat…
Yes, it's literally a theory about a conspiracy . That doesn't mean it isn't true. And Elon Musk saying he wants to create Mars colonies doesn't make it true, anymore than Howard Hughes saying he wanted to mine magnesium nodules off the ocean floor made that true. Look at Starship objectively. It's not a Mars rocket. That bellyflop through the atmosphere stunt won't work on Mars, and man-rating it even for operation…
I'm only an enthusiastic layman on the topic of spacefaring, but isn't the launch vehicle a critical variable when designing habitats for other planets? It doesn't seem practical to take anything much further than paper until the constraints of your launch vehicle are known.
Habitats designed to be launched on Starship+Superheavy are going to be wildly different from those made to launch on practically anything else because of the vast difference in lift capacity and available volume. To add to that, it arguably doesn't make sense to develop habitats at all unless something similar to Starship is flying.
So from that perspective, it would seem to me logical to wait and see if SpaceX can actually make Starship+Superheavy work or not before committing to anything. No point in burning money on something that'll never be practical to launch.