You can certainly ask again. Since people come and go from the boards (and some visit places they have not been before), you might get another answer this time. As I recall, you didn't get a specific answer last time.
I have read that they have elevators, but I don't know anything besides that and I don't know what the requirements/cautions they have for going down the slides.
The last time I looked at the official WDW site, they didn't have any info on people with disabilities at the water parks.