Have you tried to download it?
On Android, when I go to the Play store, it says that "OWA only works with Office 365", which is a far cry from what the article states: "For both platforms, the Outlook app will work in sync with Office 365, Outlook.com, Exchange, Yahoo! Mail, Gmail and other prominent email services."
Did you actually verify what can be downloaded on an Android? Why do you think I cannot find a version of Outlook that works on anything other than Office 365 (which I don't have, I have hosted Exchange)? If that's the case why wasn't that important fact stated in the article?
I'd love to see at least a little investigative, original reporting here.