I hope this question is not too dumb: Is copying content from another website also considered plagiarism?

If yes, i found only one post from July 2017 that clearly got copied.

Copied: https://bitcointalk.org/index.php?topic=1782724.msg20085279#msg20085279
Original content: http://www.etudes-fiscales-internationales.com/media/02/00/1590489700.pdf


Though i want to say that every other post seems to be written in OP's own words with no signs of plagiarism or spam.
If i may share my opinion about this case: a signature ban should be enough.

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Edit: Sorry for my mistake.