Not in Pinellas County.......SNIP
For purposes of this subsection, the term “sale” means the transfer of money or other valuable consideration for any firearm when any part of the transaction is conducted on property to which the public has the right of access.
That means public property not private property.
From the Opinion that you posted, definition section on page 9, in APPENDIX A:
Property to which the public has the right of access means any real or personal property to which the
public has a right of access, including property owned by either public or private individuals, firms and
entities and expressly includes, but is not limited to, flea markets, gun shows and firearms exhibitions.