No, I've seen nowhere it was removed !
Just a check : have you set the settings:
Touch in Settings > General > Accessibility > 3D Touch
Probably yes if it works elsewhere.
Have you registered the UIViewController for peek and poke ?
Working With 3D Touch Previews and Preview Quick Actions (from UIViewController documentation)
The methods in this task group are available on devices that support 3D Touch. The end-user terminology for the views presented during the phases of force-based touches includes peek and pop. For clarity here, and to align with the API names, this document uses the corresponding terms preview and commit view. To learn more about 3D Touch, read Adopting 3D Touch on iPhone.
func registerForPreviewing(with: UIViewControllerPreviewingDelegate, sourceView: UIView)
Registers a view controller to participate with 3D Touch preview (peek) and commit (pop).
Can also look at this tutorial :
h ttps://blog.zaven.co/3d-touch-peek-pop-tutorial/