As the wiki says, and as has been discovered through findings of lots of cartridges for the Pirated Game Museum, it appears Carson/卡聖/Ka Sheng did all sorta of IDs, besides NT being GT, KT, PS, GT, PT and I can't remember what else. Clearly NT is just another one of the ID systems. So it seems more appropriate that they're not referred to as NT, since that's just as valid as calling them KT or whatever you pick.
I'm still wondering which came first, but it does seem possible by the dates on all these different ID carts that they may have used different ID types within the same year of using others, every year. Either way, unless I'm forgetting about some games they distributed actually crediting an "NT", it looks like it's time to forget about calling them NT and from here on referring to them by their real name, Ka Sheng. I mean, even their Genesis distributed games showed the Ka Sheng logo, nothing showing NT.
Let's fight, for change! :somari:
