Well, you should read more carefully, I said "News displaying script : PHP" ... displaying, not posting ... we'll soon completly replace Coranto though, I already wrote most parts of a completly new news script.
Anyway, Coranto stores the news in a text file, that's right. But there is an addon called CorantoSQL, which puts everything into a mySQL database as well, and that one is installed. Now, when you go to the mainpage, the category is set to 'main' and that tells our news displaying script, that it should get all news from the database. When you go to the playstation section, it's set to 'psx' so you'll only see these ... it's a great way to add new features, like the "Print article" or "Send to a friend" options.
Hope this explains things a bit,