1. Creatures =/= monsters
2. I don't get why OP is so damn sure the creature inside is NT coded it literally looks like a child which can represent something vulnerable and in need of protection. Considering masking is protecting us from bullying i think it's pretty accurate. Too far fetched? I'm an artist, i know what I'm talking about I absolutely would represent something in need of protection as something small like that. And a lot of artist throughout history did.
3. The fact that the artist drew all the ND disorders probably does mean they don't talk from own experience in all pieces BUT (prepare yourselves) YOU DON'T HAVE TO EXPERIENCE EVERYTHING TO DRAW IT! They might have ND friends or special interest in ND disorders for all we know :) Imagine if people weren't allowed to draw other cultures because they aren't part of it even if they did their research.

If you specifically don't relate to their art it doesn't mean it's bad, it's just not for you. I am autistic and i don't see anything offensive in this art i actually relate to ot like a good chunk of people in the comments here.