Logic 8 is made by Apple. Native Instruments is a separate company.
All Native Instruments plug-ins are what you can call "3rd party" plug-ins so they can be used within many DAW's like Cubase, Sonar, Live, Logic etc.
I can never say 100%, but I doubt TNT2 will cover any Native Instruments plug-ins specifically because TNT2 is a Logic based tutorial.
Hope that clears up the differences between Apple Logic & Native Instruments products.