The state of FL owns <most> of the water/submerged lands which lie below the mean high water line. Normally that translates to being reached without going on shoreline but it isn't the fact that the water is navigable it is the fact that it is state owned that allows the access. Very similar but if its navigable and not state owned access doesn't apply.
That's why they checked the title of the land around Poe Springs before agreeing that public had access. They don't look at the navigation issue but of course you can't trespass.
For a specific location, you would need to have the entity mentioned in the article (DEP, specific contact is given) check the title of the submerged lands. Some areas are not state owned.
Miranda

