I don't think so. The showcase on PhoneGap was posted in July 2012. Additionally, it's easy to tell that the app isn't utilizing the Cocoa Touch UI framework. Look at how the views bounce, how the buttons "feel". Those are dead PhoneGap giveaways.
I've found that most people don't care about this unless you're delivering an extraordinary native experience (ala Path)
A native app is great if you've got a team who can do it well. If you can't, simple PhoneGap-ish apps will suffice. It's a sunk cost in that if you get traction, you'll eventually need to switch over to native to compete: effectively a re-write.