I was reading the article trying to find a source cited where I could see where the depersonalization symptoms are better described but didn’t find it. Anybody have a better link to primary sources?

I can't either. In fact a lot of the literature from NASA seems to explicitly contradict the claims in the article[0][1]. Obviously not dispositive, but this article reads to me at least partially like AI confabulation. Perhaps my Google-fu is lacking here but I had Claude do a search as well for good measure and couldn't find any supporting evidence that way either.

[0] https://humanresearchroadmap.nasa.gov/Evidence/reports/BMed.... [1] https://link.springer.com/chapter/10.1007/978-3-642-30583-2_...