I have found the entire episode pretty interesting, but not because this has anything to do with magic. It's because what we seem to have here are people who are operating in the media as amateurs. I don't mean that in a derogatory sense. It's a bit like amateur bloggers calling themselves journalists, even though they have never received any journalistic training.
There is, as ever, a lot more to working in the media than owning a decent video camera or being able to string a sentence together.
What we have here are people 'broadcasting' their thoughts on artistic works, in much the same way as the BBC or any other television broadcaster would when producing a film/book/other review show. The difference between the WPR and the BBC is that the BBC is staffed with professional journalists, editors, producers, lawyers and so on. They are acutely aware of the libel laws, which is why they may savage a book/film/whatever in a review, but they are careful to do their research first. For example, they might read it first

If they find what they think is plagiarism (about the closest thing I can think of that relates to this episode), they would triple check this before making an accusation in public.
It seems to me that in this case the reviewers on the WPR failed to check both sides of the story and then made an inaccurate criticism. If they were my staff, I would point out to them that libel can occur in a number of situations. You don't have to have malicious intent - you can commit libel simply by failing to do your research properly.
I have no idea what goes on behind the scenes at the WPR but if a lawyer pointed this detail of the law out to me after the fact I would certainly apologise as sincerely as possible - because that could divert a libel action.
The media is a powerful thing, and with great power comes great responsibility.
Personally I've enjoyed the shows but always felt that as the reviewers also sold the items the reviews could never be 100% unbiased. Maybe they are/were, but the fact that the WPR is part of a magic supply business definitely damages the reviewers' credibility. This latest scenario has not helped, of course!
T.