There is no such thing as a "NEC-98"... The system this game is for is called NEC PC-98.
The article has it correct. The title and the tags in this post are wrong.
Maybe someone can fix that?
Other than that the article is quite interesting, and the effort that went into translating it must have been enormous.
Sometimes the tag system lacking hyphen sucks a hairy meatball:
Bec pc98 or necpc98 and not nec PC-98