[Edited 03/24/2020]
That message refers to 2018 tax returns. The TurboTax Easy Extension will be available later in March. You have until July 15th - 2020 to file your extension for 2019. Check back later, or go to IRS.gov and print a form 4868, fill it out and mail it in.
Get the latest on tax deadlines and guidance for your state below.
https://blog.turbotax.intuit.com/tax-news/is-the-tax-deadline-delayed-what-to-know-about-coronavirus-covid-19-and-your-taxes-46320/#state-tax-updates