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It's rumored and a fan translation. Wait for NoA to post something about it before you get your pitchforks.
People try to fan translate all the time and sometimes they mistranslate things either by accident or to clickbait.
EDIT: From the linked Redddit thread:
This probably has to do with their whole one island per Switch thing.
If you transfer a save without transferring every user on said island then the data would corrupt/incomplete since the other users would no longer be present?