Their source differs from the original. Ironically, they translated an already-translated article.
I think this is fine, but the problem is that we're just seeing users post articles and then link them to count as substantial posts. I don't like that.
With a source, OP is fine from plagiarism. I don't think the forum is too strict and requires people have to leave initial sources to not be considered as plagiarism and get account restrictions (perma bans for this rule break).
Unfortunately, there is another accusation on OP:
Using Automated Translation Tool to Post on English Boards, is it Allowed?. This rule break does not cause perma ban AFAIK.