They're definitely not official NEC. I classify them as official TZD merchandise because when I bought them I was told they came from TZD, which was granted marketing rights in the US by NEC, if I'm not mistaken?
And yea, It's annoying, I have to put that wayback link in there or the ebay spooks get all excited about "region converting" "video games", as they've been taught by their corporate masters that countries shouldn't share things unless officially allowed to do so. Has nothing to do with trying to claim these as more official than any others or anything. It's just the only way to keep my account from getting canceled again. ;-)