I can't be plagiarism if it's THE ACTUAL LINK to THE ACTUAL CONTENT. Unless someone SPECIFICALLY TAKES CREDIT by making an OVERT STATEMENT OF OWNERSHIP OR CREATION then they are making no claim of ownership, thus, no plagiarism.

Now, if they renamed someone else's content "as though they created it" and then "claimed to have produced it themselves", that's another story, but this doesn't seem to be what's going on here...