The one year offer is still there if you purchased a new iPhone, iPad, iPod touch, Apple TV, or Mac, after September 10
https://www.apple.com/newsroom/2019/09/apple-tv-launches-november-1-featuring-originalhttps://support.apple.com/en-us/HT210573
and
https://support.apple.com/en-us/HT210573
Here’s how to redeem it:
Turn on your new Apple device and sign in with your Apple ID.
Open the Apple TV app. Make sure your device is running the latest version of iOS, iPadOS, tvOS, or macOS.
The offer should be presented immediately after launching the app. If not, go to the Apple TV+ channel page where you’ll see the offer.
Tap Enjoy 1 Year Free.
Once activated you can view, change, or cancel your subscriptions
Or Contact Support if you can’t get the one year and qualify under the above terms