It specifically says in multiple areas of the article that it's not available today.
"Google Colab will soon introduce..."
"Access to these features will roll out gradually in the coming months, starting with our paid subscribers in the U.S. and then expanding into the free-of-charge tier. We'll also expand into other geographies over time. Please follow @googlecolab on Twitter for announcements about new releases and launches."
"Google Colab will soon introduce..."
"Access to these features will roll out gradually in the coming months, starting with our paid subscribers in the U.S. and then expanding into the free-of-charge tier. We'll also expand into other geographies over time. Please follow @googlecolab on Twitter for announcements about new releases and launches."