The story is more complicated than that, apparently. Somebody alert Joe H! And we may need a thread split.
Not only is York Castle serving Caribbean food, it may be undergoing a name change to "Tropical Ice" in the next few months (*). The person I talked with implied that it would be more of a slow phase-in, rather than an overnight change. Same ownership, same product, but with expanded savory items (my impression is that they're just dabbling in savories right now, which is why I don't want to be too harsh in the next paragraph).
Original owner Calver Headley has just reopened York Castle in Rockville, in the former Kohr Bros Custard stand on 355 north of town center (827 Hungerford Dr., in the building between Caribbean Feast and Cameron's Seafood), taking with him the original recipes and methods. He's in litigation against Caroline Tay over the original Silver Spring location, and expects a resolution in the next few months. Cal also says that she's now using her own ice cream recipe in Silver Spring - unrelated to the Gifford's recipes - and has been for the past two years or so.
York Castle had a test opening over Labor Day weekend, and began regular hours last weekend. Not all of the flavors have been run yet, but most of them are in his freezers now, and I can happily report that they're as deadly buttery as ever. Try the black walnut. Sadly, they had just run out of the legendary peach.
(On a related note: WaPo's story last year about Andrew Gifford, in which the Gifford's story is retold. And even more fascinating, Andrew's own story of the recipe's convoluted path.)