The cache is not at the posted coordinates.
A good old geocaching treasure map hide. Eventually, a green box of treasure awaits for you.
This puzzle can be solved at Jigidi on the Internet - the link is provided below. The best thing to do is to register with Jigidi for free so that the puzzle progress can be saved. It is recommended that you solve the puzzles on a larger screen and not on your smartphone. You are leaving the geocaching.com page to solve the puzzles in a browser. As the owner of the cache, I guarantee that this site is safe. However, their content has not been reviewed by Groundspeak or a geocache reviewer.
Link: Treasure Map
After solving the puzzle, the treasure map and instructions will be provided.
Once you have solved the treasure map puzzle, use your GPS to come to the posted coordinates. At the GZ, you will find a large downed tree with a nook of land to stand against it. This specific spot will be needed with your treasure map to locate the geocache.