I mean, fair. My first impression of the harry potter one was that it was some high-budget ad, but it's just some guy making weird mashups and exploring what's possible with AI. The balenciaga one just stuck because it was a perfect collision of familiar (harry potter) and uncanny (luxury fashion).
It might be the cynic in me talking, but I doubt this wave of Balenciaga ads is just the outcome of a random guy overusing a set of parameters. It would be trivial to find any other theme to exploit, but this is too focused on a single brand and relentlessly pushing it's name. It's guerilla marketing no matter of where you look at it.
Do you have any proof? Everything about it seems like it's a naturally-occurring meme. Nobody pushed it until it went viral 2 weeks after the original video, and the channel has clear history of many different experiments that didn't go viral.
This seems like "organic" marketing in the sense that an individual is parodying a brand but as a consequence giving the brand lots of exposure. This is no more guerrilla marketing than if a food reviewer gave exposure to McDonalds.
