My notifs brought me right to this post and I almost thought you meant the post above mine before I realized there was another new one! Thank you for specifying, it's helpful to have more insight. I'm very familiar with local organizations (multiple family members and only recently realizing myself have ASD) but our family has never been very involved with or studied the national organizations.My above reply answers a bit of this. In short, KultureCity works *with* autistics (and those with other sensory needs, like ptsd) and listens to the community. IBCCES is people who don't have autism and don't want to learn from those with it.
Given the Denver Zoo has previously discussed some autism-related accommodations and interests before this, I want to think they are leaning on a deeper bench of information than what IBCCES would offer by itself, which would hopefully suggest this is just a certification they happen to qualify for rather than representative of a closer link.