Is the Game Center tutorial still relevant?

Hi. This is my first post on the Stencyl forums. First of all, I would just like to say thank you and great job to the team. I'm currently nearing the completion of my first game (yay!) made with Stencyl. Now for my question.

 I was following the tutorial located here:
http://www.stencyl.com/help/view/ios-game-center/ 

And more specifically part 2 of the tutorial located here:
http://code.tutsplus.com/tutorials/ios-sdk-game-center-achievements-and-leaderboards-part-2--mobile-5801

When I'm in Xcode I see all kinds of warnings and errors related to the classes and functions it's trying to use. The screen shot is attached. I see Jon updated his tutorial at the beginning of this year and still referred to the tutsplus.com article written in 2011. I'm inclined to believe that the article might be outdated considering the amount of errors and warnings generated in Xcode.

I would just like anyone who has recently and successfully integrated Game Center into one of their Stencyl games to confirm for me that it's safe to continue following the tutorial and perhaps let me know ahead of time if there are any steps which may have changed slightly (and if you're feeling kind enough, what they are).
 

Did I follow the ask a question guidelines correctly? Any tips on how I can clarify this question?

I haven't worked with Game Center before, so personally I probably won't be much help. Those "deprecation" warnings would seem to imply that there is indeed some issues with outdated stuff.

Can you more specifically highlight sections of the tutorial you are unsure about? It might help people zero in on the problem.

I tested Game Center yesterday in the simulator and it worked fine.  Why are you following a code tutorial?  Blocks are all you need.  Also, use the regular testing/publishing, not publish to Xcode project (it's not working yet).