Looking at the satellite imagery, it seems like the channel between the two is a bit deep for them to be connected at low tide. And that's comparing all the built-in imagery in ID. The CGNDB also only applies the name to the North island. (https://geonames.nrcan.gc.ca/search-place-names/unique?id=dad9a58baff311d892e2080020a0f4c9) I'm inclined to think it was a typo in the original data source you were using unless you have a reason to think otherwise, Martin868.