If you don't have access to directly make a claim, that solution is exactly what he walks you through. But if you're looking for more clarity, the original video https://www.youtube.com/watch?v=Mz14Ul-r63w also discusses the use of a third party to make a claim through the Content ID system. Jump to about 3:30 into The Original Ace video.

Just don't stick around the outro on the original vid. It's terrible, more proof-of-concept than anything.