Adult with autism here. I greatly appreciate the increased awareness of invisible disabilities and think it's extremely important for people to recognize that autism is not something that people "grow out of" and that autistic children become autistic adults. Which means representation is very valuable for all ages. My daughter loves when she sees something meant to represent neurodivergence. She says "they're like you, Mama," and it means so much to her. But that doesn't mean that representation is always possible. Because it's invisible in most instances, it's extremely challenging to represent cognitive disabilities in things like a ride.
But seeing this kind of representation DOES matter.
The one thing I would say about your post that is a bit of a misrepresentation is that autism isn't a mental illness, it's not psychological. It's cognitive, which in turn impacts emotion, expression, interpretation of the world around us, and communication. It varies wildly from person to person, which makes representation difficult as well.