I can’t really comment on the “carbonation system” you’re referring to and the photo you provided is far too small for this old guy to see and comprehend. Regarding the ingredients in the kit, I would say the malt extracts MAY be okay to use. However, the hops and yeast are no doubt unusable and should be replaced with fresh.
If NB no longer sells whatever it is you have, it might be because it didn’t sell very well or it didn’t work very well. If you’re interested in learning how to brew beer for the first time, I suggest a book by John Palmer titled: “How To Brew”. It’s a great book and brings you through all necessary aspects of the craft. Also, I suggest buying a “Home Brewing Starter Kit”. This kit will have all the necessity items needed to brew your first extract kit - excluding the ingredients.
Good luck and don’t be afraid to bring your questions to this forum. There is a wealth of knowledge and experiance right here at your fingertips.