The third party isn't approving anyone for theme parks, they're just verifying that there is a disability. The theme park still determines whether or not accommodations will be offered, and if offered, what those accommodations might be.Explain to me how a 3rd party is approving someone for theme parks and disney is not… come on.
At Universal, if they approve accommodations, you keep those accommodations so long as you keep the IAC up to date (annual).