Because while they weren't around when these movies released, they were raised on them. VHS releases of the 90s Disney classics were pretty much on loop in mine and many of my friends households.Why are college students who wish they were 90s kids a key demographic?
Not to mention with TV being at least a decade behind in terms of writing young characters, the characters they were watching on TV all were 'Cool 90s kidz' that they emulated.
Not to mention that freshman for this group of college kids were born in 99-00. With a range of four -five years for college, most college students are 95-00.
Growing up with that media imprints that 90s style, and once they're finally old enough to do stuff on their own of course they'd naturally try and emulate it.