I would definitely recommend focusing more on Li and how the "urge to return home/speak with family members" symptom isn't actually what it first appears to be. As is, we only see the fact that Li talks about wanting to go home but declines to actually do so, and the fact that the son referenced in Document 2397-1 never actually met or became aware of his father. Those are decent hints, but they're pretty subtle, and weakened by being in conflict with the description of how the area makes you want to go home, which is established early on and therefore has primacy in the reader's mind.
There are ideas that are very effective when very little is said about them (to let the reader develop their own theories, or to let them grapple with the uncertainty of what the missing information is), and this site has a reputation for that sort of thing- but I think your idealized-nostalgic-homesickness concept would be better conveyed with more than the current level of description.
If the description of Junior Researcher Li's reactions and of Mr. S's history are strong enough, you might be able to drop Document 2397-1 entirely (which I gather would be an improvement in some readers' eyes). If the events documented in the article give us a good enough impression of what the effect is and where it might have come from, we can draw our own conclusions about the intent behind it, and the SCP doesn't need to explain itself in its own words.