I think you may be misinterpreting this. When the agreement says "by valid license/permit holders from respective states," it may be referring to permits issued by respective states, rather than requiring license holders to be residents of those states.
As far as the PDO blurb, Florida does not allow people to carry on non-resident permits from other states. Someone may have been talking about not being able to carry in Florida on a non-resident Pennsylvania permit and gotten misinterpreted somewhere along the line.
Rather than flying off the handle right now, why not write the Pennsylvania AG's office and ask?