Re: "Elon Musk is a big Adams fan."
A lot of tech people are fans of sci-fi, including most of the famous ones. In my experience, many of them also don't understand what they read. Metaphors, context, world building, and other important ways to understand why some plot or setting point happened seem to fly over their heads. Examples of this are all over the place:
* AI promoters describing how AI might take over jump straight to AI control theories seemingly lifted straight from Ellison and Asimov, not considering that their AI works in a completely different way and that they were often using it as a metaphor for human sociology.
* More extremely, a worry that AI might control nuclear weapons or something similarly destructive and decide to kill people with them, seemingly not considering that the science fiction pioneers in the 1950s and 1960s might be thinking a lot about what humans would do with those but that there are many other things a theoretically independent AGI might want to do instead.
* People obsessed with leaving Earth to colonize other planets whose colonies look suspiciously like those envisioned by Bradbury or Clark, not considering that those were mostly made up because nobody knew what it would be like to try to live on Mars and that they often explained how much damage humans were causing by doing it that way.
* People intent on finding aliens whose imagination of what they'd do is remarkably like those from Le Guin's works, not considering that she had a lot of political and philosophical points she was using those to make.
* "Futurists" who, when they decide to imagine the future, grab concepts from every science fiction author that already did that as scenery and pick their favorites, not considering that the people using nanotech surgery machines, fusion power, or immersive virtual reality were either doing that to investigate the consequences of the tech or had it as background whereas the futurist's job is to consider whether it's actually practical or likely to be when they're predicting it, not just if they think it would be cool.
I'm not surprised that Musk considers himself a Hitchhikers fan. It doesn't mean he knows why any of what he likes was written there.