I don't think this is the death of creativity. It is just a new kind of non-creativity. He is comparing to a baseline of zero (or perhaps negative) creativity before AI.
Without AI, it's likely that neither of these videos would have been made, right? Five years ago, was it a normal thing for even one, much less two, groups of wedding guests to produce a video to show at a wedding, and if so, would the video even have been good? I mean actually good, not "it's the thought that counts, A-for-effort" good.
Isn't this like saying, "I decided to write a song for my friend's wedding, and I used AI to help me, and I played it and everyone liked it, and then someone else played the song that they had AI write for them, and it sounded just like mine, and everyone loved that too!"
Writing songs is something that's been around long enough, that if guests had made a habit of performing their original songs at weddings, even a graybeard like me would have experienced it. The baseline to compare to is no original songs were performed.
As it happens, in the weddings I've attended, I've heard exactly one such wedding song, and it was awful.