Because the review was the number one video on youtube, it would seem Cartoon Network wants to get a piece of the attention so they've submitted what seems to be a completely false copyright claim. There is no CN video material in the Part 1 AotC review, don't know the source of the background sounds, but that's no reason to question the video. This is a False Claim and hopefully someone will take notice of this faulty practice.
here's a copy of the video: