That’s what it says, but private establishments can tell you you cannot come into them armed, or if they are your employer, they can tell you you cannot be armed while on their property.
The Santa Clara County Fairgrounds is not a private establishment. This ruling is flawed, but it does have the benefit of making it impossible for the anti-gunners to appeal the incorporation ruling.
I used to think that, bu: is that not an infringment? “SHALL NOT be infringed” means nowhere, no way, no how.