Do you know what weirdcore is? How do you define it?

Three things.

In the first minute the narrator says that it's too early to define it, then spews for another quarter hour.

Second, back in the day it was called 'Dada' or 'surrealism.'

Third, read author Tanith Lee or the Dr. Strange comics drawn by Steve Ditko.

more like a revival of early internet aesthetics, i.e. shitty 3D graphics, low quality digital images, and WordArt from the late 1990s