See Data Sheet Pic attached
Yes, the coating on the screws will prevent corrosion.
Description notes ' zinc coated' so they would be resistant to rust.
No, If the box does not say Simpson Strong-Tie, then you purchase something other than the original product.
No, use a longer and stronger screw.
Not familiar with your usage
No, you should be using exterior treated screws for that purpose.
#2 apex tip
Yes. I just finished a reloading bench for a friend using those same connectors with these screws and they worked perfectly.