This is a direct result of a push from within the autistic community to stop using eugenicist labels and notions of "more" or "less" autistic. The community is really sensitive to eugenics because of all of the people trying to do eugenics against them and treating them as subhuman.
Autism isn't a scalar. One is not more or less autistic than another. It's a multidimensional vector space where each individual has unique needs and disabilities throughout that space.
We also don't really talk about the IQ angle because, again, eugenics and elitism. It is a fact that some or many autistic people are incredibly intelligent, but it is exclusively allistic people who get hung up on this point. For autistic people, it's just the way things are and we have to make do, just like with everything else in life.
Turns out when a lot of people want to murder, sterilize, experiment on, or genetically engineer you, you get pretty sensitive about other people using actual, factual, literal Nazi eugenicist ideas to describe you.
That's why everyone should be using the terms that autistic people choose for themselves. So that you're not continuing to promote, again, actual Nazi war crimes as a way to distinguish "good" autism from "bad". That's why we've purged Asperger's as a diagnostic label.