If true, and it’s looking like it, the pair will be the first water-tight foldables in the world. Yet dust can also be a bane for foldables and their hinges in particular so it could prove more important for them to have dust protection, than water. It’s unclear if they are lacking that or the tipster just doesn’t have information about it at this point, though.
Foldables have a flexible screen and a hinge, both of which move and make sealing the device harder than your regular bar phone. Still, adding water protection is massively impressive on Samsung’s part.