If I read it correctly, The Fine Article explicitly says otherwise: It suggests that the people were likely employees of a Japanese logging company, but settled in the forest when the logging petered out and became self-sufficient.
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I guess it depends upon the definition of a logging camp or settlement. In another discussion on HN, the definition is based on whether the settlements are seasonal or only inhabited for the duration of the logging work.
If this settlement was year-round, and occupied for two decades after the work dried up, it had transitioned from being a logging camp to being an independent settlement.
https://www.google.com/search?client=ubuntu&hs=1AJ&channel=f...