See, I don't like the gatekeeping attitude with this.
Macintosh Plus had one of the largest (if not the largest) vapor hits. You point out that it's an "American" genre, yet Floral Shoppe doesn't have a single track title in English. Hell, you're posting in Japanese right now. So, the Japanese aesthetic is okay, but one of Japan's largest exports (anime) is off limits?
Lupin the 3rd, Cowboy Bebop, and Ghost in the Shell were massive parts of my life during same time that malls were still thriving and Sega was running those big in-your-face "Sega!" advertisements. I started with Windows 95, then 98, 98 SE, ME, etc. and I loved the "aesthetic" that Macintoshes had to offer even if I never owned one. Vapor has always been about nostalgia for me, though I can slightly empathize with the viewpoint that vapor inherently has anti-consumerist roots. All of this said, why is anime off-limits but other pieces of the "east Asia aesthetic" aren't? If we're going to put vapor into this neat little box with all these rules, maybe it is true that vapor is dead. (sidenote: even if vapor is all about consumerism, anime actually fits with this perfectly. Some people's entire lives revolve around watching 2D characters on a screen. And the fandoms...and the claw machines! Anime is a consumerist goldmine, as far as I can tell)
To me, and you're welcome to disagree, "vaporwave" is a bit of an umbrella term much like "industrial." Industrial encompasses such a vast array of music with similar qualities, right? Ministry, Nine Inch Nails, Marilyn Manson, Rob Zombie, or we can go back to Kraftwerk or Depeche Mode or Gary Numan or whoever. There's some obvious differences between these bands and they certainly slot into different subgenres of industrial, but they're all industrial at the end of the day. Then The Gothsicles comes along with the album NESferatu. Some of the current/former members of the group include Brian "darkNES" Graupner, Matt "Sega Lugosi" Fanale, and Dan "Turbo Gothic 16" Clark. But you wouldn't say, "well you can't find any early industrial with the 'video game' aesthetic, so therefore The Gothsicles are not industrial," would you? Maybe you would say, "I don't like this video game industrial aesthetic or whatever it's called," and that's okay! No one is forcing you to enjoy or even consume this art. But to come at it from a gatekeeping perspective and say, "that's not real industrial!" is a fruitless endeavor. They're going to keep mixing the aesthetic that they enjoy with the music genre that they enjoy, and they're going to create interesting art and a unique aesthetic in the process. Maybe neither you nor I will enjoy this art nor this "unique aesthetic," but that doesn't make it any less valid, in my opinion.
Hope that makes my position clear. Maybe you define vaporwave as a much more specific genre than I do so we'll have some friendly disagreement there, but I'm happy to listen to your opinion on the matter.