They're making it (I linked above) but my guess is that they're still pretty fragile. The microstructures and nanostructures that minimize contact surface area

They're making it (I linked above) but my guess is that they're still pretty fragile. The microstructures and nanostructures that minimize contact surface area can be flattened or broken super easily and then your perfect phobic material becomes partially porous. So I would say it's not hard to make them, but it's hard to make them robust.