This doesn’t make any sense. The article clearly states you can import contacts from a SIM card into the iPhone and then there is a statement at the end that says the SIM holds no contacts.
In reading an article on Apple support about “how to import contacts from a SIM card onto the iPhone” and article explains how to do this, there is a statement at the very end of the article that says the SIM for iPhone stores no contacts. I don’t get it.