I was thinking more of seven types of fantasy rather than seven levels, so this wasn't what I expected, but at the same time, I mostly agree with what he said. It is about, as bryony described it, seven levels of quality within fantasy writing, which apparently follows along the lines of the other "seven levels" videos that inspired this guy, which I was unaware of until this video pointed them out.

What I was thinking of is more like subgenres within fantasy. If you go to Wikipedia, you'll find a list of more than 30 subgenres described under that heading. And some of them are more finely differentiated than what I was thinking of, or distinguished in different ways from what I was thinking of, so that's not quite it either. Eh, whatever, here are my seven types. There's no particular order to these, so they are not numbered.

• Sword and sorcery. This very classic sort of fantasy takes place in an alternate world (or an alternate historical Earth) in which magic exists, though typically only a small fraction of people have any ability with it at all. The world either never developed technology because of the existence of magic, or it hasn't gotten there yet. There may or may not be fantastic beasts like dragons or intelligent nonhuman races who live alongside humans. This style goes all the way back to the legends of King Arthur. In more modern writing, Lord of the Rings falls squarely within this type, as do Wheel of Time, Game of Thrones, and many others.
• Technological fantasy. These stories take place in a more modern world, one in which the fantasy element exists but is so rare that nearly all people don't know it exists, and those who perform magic or know about whatever the fantasy is live in their own subculture, in which they are free to combine modern technology with magic or fantastic beasts or whatever it is. The Chronicles of Amber is the kind of thing I am thinking of here, but stuff like Ghostbusters also lives in this category.
• Magic isolated from technology. These stories have magic within a fully developed world of its own that exists alongside a world without magic and with modern technology. Sometimes there's an actual barrier as in Apprentice Adept or Well World, or there's some other means of transportation between the two as in Alice in Wonderland.
• Magic replaces technology. In these stories, rather than an absence of technology, magic is used to do things instead of some of the kinds of technology we know, though other kinds of technology may still exist. This can take place as in Harry Potter (which also has elements of some of these other categories) or as in the Discworld. The Flintstones is a version of this where it's dinosaurs instead of magic.
• What if. In these stories, there's a realistic world in which there's one thing different from the real world and the stories explore the consequences of that. An example is body-switching stories like Freaky Friday.
• Superhero. These stories feature people with fantastical abilities, or fantastic artifacts that imbue people with such abilities.
• Mythological fiction. Stories that take place in which the gods and legends of myth are real.