In my opinion, it is clear the author simply copied that video, because not only is it the exact same set of papers, if memory serves (as I watched it only last week), it is in the exact same order, which is particularly determinative. Citation would be appropriate at the very least.

A citation would absolutely be appropriate. However, you have it the wrong way around.

This blog post was published Jun 17, 2016.

The Numberphile video was published Dec 7, 2016.

I stand corrected then. And disappointed... I like the Numberphile videos.