Most of the terms that are used to describe autistic inner experience were coined by allistic people.
Even the ones that weren’t are almost always based in the neuronormative framework of “society”.
Meltdowns, shutdowns, burnout, masking, and function all exist. But the way we think about them and define them is inherently not according to our own experience.
The fact that "meltdown" is also casually used to describe things like entitled people just voluntarily throwing a fit they didn't get their way really drives that point home.