Not infantilizing autistic people is incredibly important, but autistic people having their needs met, even if they are different than yours, is not infantilization. When you make statements like ‘autistic people don’t need x, we aren’t children!’, you are the one equating that need w being inherently childish - and, fun fact, autistic people all have different needs!
This is particularly apparent in y’all’s treatment of autistics w comorbid intellectual disabilities. In your attempt at disproving the stereotype that all/most autistics have IDs you’ve circled right back around to being ableist and are alienating a massive part of the community. Autistics w stereotypical traits aren’t perpetuating ableist stereotypes, ignorant allistics are.