This is such a B.S. article. Disney has never had a "homemade" Dole whip recipe.
If fact, if you make this recipe as shown, it tastes terrible. Fresh/frozen pineapple has a high level of enzymes that react very badly with milk proteins and basically start to break it down in your mouth. It ends up giving you a really gross aftertaste. Try it...eat some pineapple and then drink milk or take a bite of ice cream. Blech. This effect gets mitigated with cooked pineapple, which is often how you find it when it's an ice cream topping.
I made this once in my blender and took one sip and dumped it down the drain. It was horrible.
There is a good reason why Dole Whip mix (and the "real" recipe from Dole) doesn't contain real dairy.