Finally was able to watch the videos. A few impressions:
1) Marshmallow Fluff is often written off as a bizarre novelty that Americans do not actually eat that only appears in international food sections, but Marshmallow Fluff is very commonly consumed in New England (where it originates). The "Fluffernutter" is second fiddle to only the PB&J when it comes to childhood lunchboxes. It's far from a staple or anything, I only buy about a container a year, but it's something as a New England native I take for granted. I get that this is regional though, so if you were not from the northeast you may not even know what it is. But I still think regional favorites with strong reputations are still representative of American food rather than an exaggerated misfire.
2) Later in the video they show a picture of "American Cookies" from Germany which are chocolate icing on one side and vanilla on the other side. Contrary to its presence in this video, this is indeed a typical American confection that I think is correct to associate with the United States. This is called a
black and white cookie and they are sold almost everywhere. They also originate in New York City, where if anyone is going to visit the United States they would probably visit. They are a famous American cookie and the subject of plenty of pop culture, including an famous Seinfeld episode.