I’ve just seen this email transcript posted from Disability Services in response to a query.
“International Guests visiting May 19, 2024 or earlier may request to register for Disability Access Service (DAS) directly with Guest Relations Cast Members.
For International Guests arriving May 20, 2024 or later, Guest Relations Cast Members will have devices available to lend to our Guests so they may chat with DAS Cast Members on-site should they be necessary.
Please note that if a DAS is provided, Guests only need to do this on the first day of their visit, not every day. The DAS will be valid for the duration of your visit. No documentation is needed. "
So you won’t know whether you qualify for DAS in advance. You essentially have to be willing to do without it if you book.