Had to think about this but I don’t think an island is considered an exclave.

The reason for this is because it is entirely surrounded by water, not another piece of land. Islands are not usually considered to be exclaves.

https://homework.study.com/explanation/is-hawaii-an-exclave.html it’s paywalled but the answer came through on google.

The island is right beside both Canadian and Denmark (greenland) land, so it’s not exactly isolated or surrounded by either.