Because if he only translate it and post the translated text its not a plagiarism in my eyes !
It's the same, it's still plagiarism, if not we could buy books with "Macbeth" and "Hamlet", by Pang Qing or Mustafa Ashkar.
It's not his work!
Back to the main subject, I think the tactic is pretty old. I've come across many posts from Russian speakers (based on their history) and they posts followed the same pattern with short phrases that don't make 100% sense in English. Obvious they were translated but it's a damn pain in the ass to try to find the source for somebody not used to the Cyrillic alphabet.