Wading ankle deep isn't swimming and apparently the 'white sandy beach' is used in advertising the resort.
When signs are posted No Swimming, you aren't to get into the water. Especially alone, when you're 2 years old, and it's night time. It's like a No Admittance sign. They don't post why you can't go in there, they just tell you that you can't.
Disney has been in business for decades, half a century even, and this is the first time this has happened, yet a lot of people act like it happens all the time there. Some of the media people are calling for blood and acting like Disney World should shut down.