The article's assertion that it's unique in the world is misleading. There are many tidal causeways. I've personally driven across one in Northumberland that connects the mainland to an old monastic island.
Does it say it is unique? In any case, the path/track in the article is no causeway. Tidal causeways are indeed found in many places but this is a bit different. Causeways tend to go somewhere. This just a safe path through the flats.
