I only claimed that this material appears copied and pasted from elsewhere

Ok, fair enough - but the claim you make is based on what?
Good writing?
Clear argument?
(hence the request for any links).

I've had many conversions with @krnel over the years, and have never found him evasive.
Not giving any personal background story on a site based on anonymity, is not a basis for claiming copy/paste actions, from other peoples works - which is plagiarism.