If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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Likely a scam whereby he transfers money and then tells you to transfer some money back to him. Afterwards the first transaction get's flagged as fraud and you lose the money from the first transaction.
Thank you for the explanation! I posted a warning in a separate article. (Ironically, the second private message mentioned in the article was sent to my account.)