I think they're referring to specific diagnosed conditions like Asperger's, autism, or ADHD, rather than a general concept of variation?

Pretty much this. I (ADHD and autistic) have a different negative reaction to social promotion than people who are uncomfortable being social but can benefit from some coaching to make it more comfortable. I’ve been inundated with this guidance my whole life and if anything it’s only more stressful to be treated as if I haven’t.