You have grossly misinterpreted that phrase. There is nothing in the 2nd Amendment that says or states one cannot carry concealed or open carry. It does however state clearly the right must NOT be infringed upon. Know what infringed means?

Infringed:
act so as to limit or undermine (something); encroach on.

it's pretty obvious the 9th circuit was wrong in it's decision. Which by the way will be overturned by the US Supreme Court. The 9th Circuit holds the record for most cases/rulings overturned by the Supreme court.