Is this a tombolo?

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This is called a "causeway" by the local government. The "causeway" is natural, not man-made. It consists of stones and is pretty substantial when Lake Michigan is low.

https://goo.gl/maps/VujAEUtXjvQHhfVp6

Right now it is mostly underwater because Lake Michigan is high.

https://www.co.door.wi.gov/1036/Cana-Island-Camera

What I'm wondering is

1. Is the causeway a tombolo even though it is made of rock?

2. Is Cana Island a tied island, a tidal island, or both? (Lake Michigan doesn't have tides, but the lake gets alternatively deep and shallow over the course of so many years.)

For reference

https://en.wikipedia.org/wiki/Tied_island

https://en.wikipedia.org/wiki/Tidal_island

https://en.wikipedia.org/wiki/Tombolo