Security rules for all nuclear plants are the same. This article is very misleading, the key words are “ visitors parking lot”!
Good point. My bet is the closed security building is there for use during refueling outages - to control the vehicle entry rate to prevent a gate rush in mass overwhelming response time. Bet when it is manned, the guards are the rent-a-cop kind and normally unarmed (absent an identified specific threat).
I’m sure the “reporter” has in-depth knowledge of the capabilities of the bad guys. Probably a weapons and explosives expert. Journalism schools are known for producing such experts in engineering, nuclear safety, and military science.