This article is directly talking about Japanese pure literature, I think some posters just took off from the title only?

You're right that if we are comparing the wider body, there isn't really a distinction between "Western" or "Japanese", at least for enthusiasts, what matters alot more are the individual authors.

> This article is directly talking about Japanese pure literature,

No it isn't, did you even read it? It mentions animes as well, not all of the works mentioned are books.

Makato Shinkai’s She and Her Cat is an anime, not a book, for example.

Edit: They adapted that anime to a book, but a book adapted from an anime is hardly "pure literature", it is definitely pop literature.