It's a description of "neurotypical people" from the perspective of somebody who has autism/ADHD.

Neurotypicals tend to lack curiosity and passion for interests.

This is opposed to autistic people "having intense interests." If a high level of interest in a particular topic is my "normal," then other people's levels of interests seem very low by comparison.

They’re less in-touch with their senses, sometimes needing mind-altering substances in order to appreciate basic sensory stimuli.

This is opposed to autistic people "stimming" in various forms. Exploring textures, staring at interesting lights, engaging in repetitive physical movements, and more are all examples of "stimming." A lot of neurotypical people wouldn't wave their hands between their eyes and a light just to enjoy the visual (and physical) sensations that arise from it - unless they're tripping balls. Some people can't seem to appreciate a super soft blanket, or how strange their own body feels, until they've taken some kind of mind-altering substance that heightens their sensory experience. Even just on thoughts and ideas alone, I can't count how many times I've said things that made people go, "What are you smoking? (And are you willing to share?)"

Not only that, but they are overly-invested in “following the group” and “blending in,” even if it ends up harming them.

When you've always stuck out, the idea of "blending in" is laughable. I've never had the luxury of being a wallflower. I've come across so many people who have had good reason to speak up or stand out, yet they'd been terrified of breaking from conformity. From the perspective of someone who lacks the compulsive need to align themselves with an in-group, being so scared of "standing out" feels rather silly.

Does that help make more sense?