I wish I had a big "face plant" GIF here. Really irks me when people, especially people who are supposed to be professionals, use that as an excuse for using materials that will in fact rust, in any environment, and use the old "must be salt" excuse as an out.
The marine grade hand rail may just be a manufacturing issue and it rusted early, but the rust on the concrete that straps down that pipe looks like it was gonna rust if there was salt water, or any water there. How far away from the pool water is that pipe clamp?
BTW, was just in Champaign this weekend!