Some of the previous cases on Walt Disney World property have included situations where the weapon in question was legal to be carried concealed in Florida, but Walt Disney World rules do not allows guns on the premises even if they are otherwise within the law.
In previous situations people found in possession of weapons have not always been charged by police, so there might be more going on in this particular case.
If nothing else, Polit did not have a license to carry the concealed weapon.