SpaceX has no actual colonization plans. If this was the original motivation, then Musk would have abandoned it a decade ago as unrealistic after talking to experts. He did not, he only increased bullshit futurism claims in lots of areas, from traffic to neuroscience, all easily debunked.

Musk has attacked NASA the last 20 years, two decades that saw some of the greatest achievements not just in science, but in human history. Spend any time with his fans and many have no idea we are already on Mars or the James Webb even exists. That says it all.